[JS] feat: `AssistantsPlanner` support for Azure Assistants API

[singhk97]

Linked issues

closes: #1497 (issue number)

Details

BREAKING CHANGE

• Updated AssistantPlanner to use @azure/openai-assistants as the underlying client. This supports both OpenAI and Azure OpenAI assistants v1 endpoints.
• Updated math bot to use Azure OpenAI Assistants API by default.

Note: Should migrate to official openai-node library once azure support is checked in. Here's the PR/

Attestation Checklist

• [x] My code follows the style guidelines of this project

• I have checked for/fixed spelling, linting, and other errors

• I have commented my code for clarity

• I have made corresponding changes to the documentation (updating the doc strings in the code is sufficient)

• My changes generate no new warnings

• I have added tests that validates my changes, and provides sufficient test coverage. I have tested with:

  • Local testing
  • E2E testing in Teams

• New and existing unit tests pass locally with my changes