Integration with AI SDK

[tconley1428]

What was changed

Added a new AiSDKPlugin to support running AI SDK in workflows. The plugin registers new activities for model invocation and optionally MCP tools. Workflows can then use temporalProvider to create models in workflows.

Why?

Checklist

1. Closes

2. How was this tested:
   Added a new test suite with local model coverage. AI_SDK_REMOTE_TESTS env variable is available to run against a real endpoint.

3. Any docs updates needed?

[mjameswh]

See my previous comments.

[mjameswh]

Ok, a few more. I expect that should be the last batch.

I'm still concerned about the generalized usage of any, but that can and should be investigated in a distinct PR, probably by @chris-olszewski or myself. I expect some challenges that can't simply be detailed here.

You did great with that PR. Thanks!

[mjameswh]

Awesome! Thanks again.