feat: implement fastapi router for connectors API

[jaideepr97]

What does this PR do?

adds a fastapi router for connectors API

Closes #4379

Test Plan

blocked on #4263 getting merged

[github-actions]

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This PR will update the llama-stack-client SDKs with the following commit message.

feat: implement fastapi router for connectors API

Edit this comment to update it. It will appear in the SDK's changelogs.

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Last updated: 2025-12-19 13:13:22 UTC

[jaideepr97]

cc @leseb
I've marked this as draft because this is not a priority for v0.4.0 and I'm also debating how this might impact the already in-flight implementation for this API in #4263 which may potentially undergo many changes itself