Feat/add openbao as provider

[eyenx]

Adding OpenBao as Provider

/kind feature

What this PR does / why we need it:

Adding OpenBao as provider including tests.

Which issue(s) this PR fixes
Fixes #1580

Special notes for your reviewer:
mostly inspired by the vault provider tests https://github.com/kubernetes-sigs/secrets-store-csi-driver/blob/main/test/bats/vault.bats credits to @sozercan @aramase @ritazh and the rest of the community!

TODOs:

• squashed commits
• includes documentation
• adds unit tests

[k8s-ci-robot]

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[k8s-ci-robot]

Hi @eyenx. Thanks for your PR.

I'm waiting for a kubernetes-sigs member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

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[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: eyenx
Once this PR has been reviewed and has the lgtm label, please assign ritazh for approval. For more information see the Code Review Process.

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[JoeMurray]

I've created a separate PR #1914 that goes with this one.

[eyenx]

Friendly Bump to @ritazh and @aramase