Add OpenBao as an additional CSI Driver

[JoeMurray]

Introduction page of docs missed in PR at https://github.com/kubernetes-sigs/secrets-store-csi-driver/pull/1902/files

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TODOs:

• squashed commits
• includes documentation
• adds unit tests

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• ✅ login: JoeMurray / name: Joe Murray (5dbde76)

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[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: JoeMurray
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