[Backport 2.x] Introduced KNNVectorValues interface to iterate on different types of Vector values during indexing and search (#1897)

[navneet1v]

Description

Introduced KNNVectorValues interface to iterate on different types of Vector values during indexing and search

Main branch PR: (#1897)

Check List

• [X] New functionality includes testing.
• [X] New functionality has been documented.
• [X] API changes companion pull request created.
• [X] Commits are signed per the DCO using --signoff.

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[navneet1v]

waiting for all CIs to complete