Add `tls_server_name` kubernetes provider options.

[bartoszj]

Description

Sometimes it is needed to connect to Kubernetes cluster using address which is not included in certificates SNIs. like IP addresses, SSH tunnels, etc. insecure parameter can be used in such scenarios, but it disable certificate validation. By using tls_server_name it is still possible to validate server certificate.

Acceptance tests

• [ ] Have you added an acceptance test for the functionality being added?

Release Note

Release note for CHANGELOG:

Add `tls_server_name` kubernetes provider options.

References

Community Note

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[hashicorp-cla]

All committers have signed the CLA.