Add Couchbase VectorDB Support

[lokesh-couchbase]

Why are these changes needed?

Couchbase is a NoSQL Key-Value Based Database. Couchbase has recently added support for Vector Search. We would like to add support for Couchbase as a vectorDB in autogen.

Checks

• I've included any doc changes needed for https://microsoft.github.io/autogen/. See https://microsoft.github.io/autogen/docs/Contribute#documentation to build and test documentation locally.
• I've added tests (if relevant) corresponding to the changes introduced in this PR.
• I've made sure all auto checks have passed.

[lokesh-couchbase]

@microsoft-github-policy-service agree company="Couchbase"

[jackgerrits]

Thanks!

[jackgerrits]

@lokesh-couchbase can you fix the code formatting check?

[lokesh-couchbase]

HI @jackgerrits , I have fixed the formatting issues
Thanks

[jackgerrits]

Thank you!

[gitguardian]

⚠️ GitGuardian has uncovered 8 secrets following the scan of your pull request.

Please consider investigating the findings and remediating the incidents. Failure to do so may lead to compromising the associated services or software components.

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🔎 Detected hardcoded secrets in your pull request

GitGuardian id	GitGuardian status	Secret	Commit	Filename
12853598	Triggered	Generic High Entropy Secret	e42837d	test/oai/test_utils.py	View secret
10404693	Triggered	Generic High Entropy Secret	e42837d	test/oai/test_utils.py	View secret
12853599	Triggered	Generic High Entropy Secret	e42837d	test/oai/test_utils.py	View secret
10404694	Triggered	Generic High Entropy Secret	e42837d	test/oai/test_utils.py	View secret
12853601	Triggered	Generic High Entropy Secret	e42837d	test/oai/test_utils.py	View secret
10404696	Triggered	Generic High Entropy Secret	e42837d	test/oai/test_utils.py	View secret
10422482	Triggered	Generic High Entropy Secret	e42837d	test/oai/test_utils.py	View secret
12853602	Triggered	Generic High Entropy Secret	e42837d	test/oai/test_utils.py	View secret

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