WIP - Support Openapi /v1/audio/transcriptions

[carmal891]

What type of PR is this?
/kind feature

What this PR does / why we need it:
Adds OpenAI-style /v1/audio/transcriptions support

Which issue(s) this PR fixes:

Fixes #2203

Does this PR introduce a user-facing change?:

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[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: carmal891
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[k8s-ci-robot]

Hi @carmal891. Thanks for your PR.

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[k8s-ci-robot]

PR needs rebase.

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[rahulgurnani]

Thanks for sending this out @carmal891 . Just sharing my thoughts here, I think it may be helpful to mention the scope of the PR in the description. I mean smaller incremental changes are easier to review and make progress.