Addition of creation of Vault App Roles through Go SDK

[ChrisJBurns]

Currently, in Golang, as far as I can see, the only way to create an AppRole and specify the roleId and secretId is via Logical calls via the API like so:

vaultClient.Logical().Write("auth/approle/role/concourse", map[string]interface{}{
		"backend":                 "approle",
		"role_name":               "concourse",
		"token_policies":          []string{"concourse"},
		"token_no_default_policy": "true",
		"bind_secret_id":          "true",
		"token_period":            "0",
	})

And then if we want to change the role_id and secret_id to be something that we choose we have to do the following.

	secret, err := vaultClient.Logical().Write("auth/approle/role/concourse/secret-id", map[string]interface{}{
		"secret_id": "secret_id_value",
	})
	if err != nil {
		log.Fatal(err)
	}
	secretID := secret.Data["secret_id"].(string)

	_, err = vaultClient.Logical().Write("auth/approle/role/concourse/role-id", map[string]interface{}{
		"role_id": "role_id_value",
	})
	if err != nil {
		log.Fatal(err)
	}

Can we just have a dedicated method like we do for enabling of the approle functionality like so

vaultClient.Sys().EnableAuthWithOptions("approle", appRoleOptions)

Seems a bit inconsistent that we have Logical calls to the API for some things and then using the dedicated functions for others.