feat: Apply schema check for Azure OpenAI client response

[ZhongpinWang]

Context

AI/gen-ai-hub-sdk-js-backlog#54.

Use Zod schema to type check OpenAI chat and embedding reponses at runtime.

Definition of Done

• Code is tested (Unit, E2E)
• Error handling created / updated & covered by the tests above
• Documentation updated
• (Optional) Aligned changes with the Java SDK
• (Optional) Release notes updated

[ZhongpinWang]

@marikaner @deekshas8 I would appreciate your opinions for this PR, especially if you like the approach with Zod. I can see some potential refactorings and automation, but feel free to mention them as well.

public api check is failing due to the generated zod schema. Unfortunately, we have to generate the schema at compile time to check types. Although we could infer new ts types from zod schema, there is AFAIK no way to create a zod schema at runtime from ts type probably because there is no type at js runtime.

[marikaner]

Generally I am not opposed to the "response" classes itself, might make access to data more convenient. However, if I got it right we are checking the structure of all responses for each request (right?) I expected this to happen in the tests only, not in production. While I think it is not super expensive, I don't see a major benefit either.

[marikaner]

LGTM