feat: support tls_ca and tls_certificate_key for mongodb connections

[cyrus-mc]

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Add TLS options to MongoDB database connection to allow verification of certificate as well as client auth. This is in line with the CLI options .

Add `tls_ca` and `tls_certificate_key` fields to `vault_database_secret_backend_connection` for `mongodb` connections. 

Output from acceptance testing:

$ make testacc TESTARGS='-run=TestAccXXX'

- WIP
...

[martinssipenko]

Is this PR dead or alive? I'd like to add similar functionality for MySQL, given Vault 1.5.0 supports mTLS for MySQL hashicorp/vault#9181 now.

If it's not being worked on we'd like to take this as a base, add MySQL stuff and fix tests.

cc @cyrus-mc

[hashicorp-cla]

All committers have signed the CLA.

[benashz]

Closed with #1146

[fairclothjm]

@cyrus-mc Hi, are you still interested in carrying this forward?