feat(pki): Add support for ACME configuration

[Viper61]

Description

This PR adds a new resource to enable ACME configuration of a PKI (vault_pki_secret_backend_config_acme).

Relates #1947

Checklist

• [x] Added CHANGELOG entry (only for user-facing changes)
• [x] Acceptance tests where run against all supported Vault Versions

Output from acceptance testing:

Vault 1.13

$ VAULT_ADDR=http://172.20.0.1:8213 TESTARGS="--run TestPkiSecretBackendConfigACME_basic" make testacc
==> Checking that code complies with gofmt requirements...
TF_ACC=1 go test --run TestPkiSecretBackendConfigACME_basic -timeout 30m ./...
?       github.com/hashicorp/terraform-provider-vault   [no test files]
?       github.com/hashicorp/terraform-provider-vault/cmd/coverage      [no test files]
?       github.com/hashicorp/terraform-provider-vault/cmd/generate      [no test files]
?       github.com/hashicorp/terraform-provider-vault/helper    [no test files]
?       github.com/hashicorp/terraform-provider-vault/internal/consts   [no test files]
ok      github.com/hashicorp/terraform-provider-vault/codegen   0.010s [no tests to run]
?       github.com/hashicorp/terraform-provider-vault/internal/identity/group   [no test files]
?       github.com/hashicorp/terraform-provider-vault/internal/identity/mfa     [no test files]
?       github.com/hashicorp/terraform-provider-vault/internal/pki      [no test files]
ok      github.com/hashicorp/terraform-provider-vault/internal/identity/entity  0.032s [no tests to run]
?       github.com/hashicorp/terraform-provider-vault/internal/sync     [no test files]
?       github.com/hashicorp/terraform-provider-vault/schema    [no test files]
ok      github.com/hashicorp/terraform-provider-vault/internal/provider 0.040s [no tests to run]
ok      github.com/hashicorp/terraform-provider-vault/testutil  0.006s [no tests to run]
ok      github.com/hashicorp/terraform-provider-vault/util      0.007s [no tests to run]
ok      github.com/hashicorp/terraform-provider-vault/vault     0.026s

Vault 1.14.0

$ VAULT_ADDR=http://172.20.0.1:8214 TESTARGS="--run TestPkiSecretBackendConfigACME_basic" make testacc
==> Checking that code complies with gofmt requirements...
TF_ACC=1 go test --run TestPkiSecretBackendConfigACME_basic -timeout 30m ./...
?       github.com/hashicorp/terraform-provider-vault   [no test files]
?       github.com/hashicorp/terraform-provider-vault/cmd/coverage      [no test files]
?       github.com/hashicorp/terraform-provider-vault/cmd/generate      [no test files]
?       github.com/hashicorp/terraform-provider-vault/helper    [no test files]
?       github.com/hashicorp/terraform-provider-vault/internal/consts   [no test files]
ok      github.com/hashicorp/terraform-provider-vault/codegen   0.011s [no tests to run]
?       github.com/hashicorp/terraform-provider-vault/internal/identity/group   [no test files]
?       github.com/hashicorp/terraform-provider-vault/internal/identity/mfa     [no test files]
?       github.com/hashicorp/terraform-provider-vault/internal/pki      [no test files]
ok      github.com/hashicorp/terraform-provider-vault/internal/identity/entity  0.025s [no tests to run]
?       github.com/hashicorp/terraform-provider-vault/internal/sync     [no test files]
?       github.com/hashicorp/terraform-provider-vault/schema    [no test files]
ok      github.com/hashicorp/terraform-provider-vault/internal/provider 0.028s [no tests to run]
ok      github.com/hashicorp/terraform-provider-vault/testutil  0.012s [no tests to run]
ok      github.com/hashicorp/terraform-provider-vault/util      0.005s [no tests to run]
ok      github.com/hashicorp/terraform-provider-vault/vault     3.727s

Vault 1.14

$ VAULT_ADDR=http://172.20.0.1:8314 TESTARGS="--run TestPkiSecretBackendConfigACME_basic" make testacc
==> Checking that code complies with gofmt requirements...
TF_ACC=1 go test --run TestPkiSecretBackendConfigACME_basic -timeout 30m ./...
?       github.com/hashicorp/terraform-provider-vault   [no test files]
?       github.com/hashicorp/terraform-provider-vault/cmd/coverage      [no test files]
?       github.com/hashicorp/terraform-provider-vault/cmd/generate      [no test files]
?       github.com/hashicorp/terraform-provider-vault/helper    [no test files]
?       github.com/hashicorp/terraform-provider-vault/internal/consts   [no test files]
ok      github.com/hashicorp/terraform-provider-vault/codegen   0.006s [no tests to run]
?       github.com/hashicorp/terraform-provider-vault/internal/identity/group   [no test files]
?       github.com/hashicorp/terraform-provider-vault/internal/identity/mfa     [no test files]
?       github.com/hashicorp/terraform-provider-vault/internal/pki      [no test files]
ok      github.com/hashicorp/terraform-provider-vault/internal/identity/entity  0.049s [no tests to run]
?       github.com/hashicorp/terraform-provider-vault/internal/sync     [no test files]
?       github.com/hashicorp/terraform-provider-vault/schema    [no test files]
ok      github.com/hashicorp/terraform-provider-vault/internal/provider 0.030s [no tests to run]
ok      github.com/hashicorp/terraform-provider-vault/testutil  0.006s [no tests to run]
ok      github.com/hashicorp/terraform-provider-vault/util      0.004s [no tests to run]
ok      github.com/hashicorp/terraform-provider-vault/vault     3.848s

Vault 1.15

$ VAULT_ADDR=http://172.20.0.1:8215 TESTARGS="--run TestPkiSecretBackendConfigACME_basic" make testacc
==> Checking that code complies with gofmt requirements...
TF_ACC=1 go test --run TestPkiSecretBackendConfigACME_basic -timeout 30m ./...
?       github.com/hashicorp/terraform-provider-vault   [no test files]
?       github.com/hashicorp/terraform-provider-vault/cmd/coverage      [no test files]
?       github.com/hashicorp/terraform-provider-vault/cmd/generate      [no test files]
?       github.com/hashicorp/terraform-provider-vault/helper    [no test files]
?       github.com/hashicorp/terraform-provider-vault/internal/consts   [no test files]
ok      github.com/hashicorp/terraform-provider-vault/codegen   0.007s [no tests to run]
?       github.com/hashicorp/terraform-provider-vault/internal/identity/group   [no test files]
?       github.com/hashicorp/terraform-provider-vault/internal/identity/mfa     [no test files]
?       github.com/hashicorp/terraform-provider-vault/internal/pki      [no test files]
?       github.com/hashicorp/terraform-provider-vault/internal/sync     [no test files]
?       github.com/hashicorp/terraform-provider-vault/schema    [no test files]
ok      github.com/hashicorp/terraform-provider-vault/internal/identity/entity  0.048s [no tests to run]
ok      github.com/hashicorp/terraform-provider-vault/internal/provider 0.055s [no tests to run]
ok      github.com/hashicorp/terraform-provider-vault/testutil  0.007s [no tests to run]
ok      github.com/hashicorp/terraform-provider-vault/util      0.005s [no tests to run]
ok      github.com/hashicorp/terraform-provider-vault/vault     3.807s

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[igor-nikiforov]

@fairclothjm Could you please review this PR? Thanks!

[igor-nikiforov]

@benashz friendly reminder.