validate json schema for OpenAI function calling result

[acatav]

Problem

Function calling only validate that the result is a valid json, but not that it's following the required schema

Solution

Validate output json schema, and retry for failures

Type of Change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• This change requires a documentation update
• Infrastructure change (CI configs, etc)
• Non-code change (docs, etc)
• None of the above: (explain here)

Test Plan

Added a test for wrong schema. Happy path covered by existing tests

[miararoy]

lg, @acatav - fwiw this requires at least one test, wdyt?

[acatav]

lg, @acatav - fwiw this requires at least one test, wdyt?

added

[igiloh-pinecone]

LGTM

[miararoy]

lgtm