docs: add Milvus integration page

[zc277584121]

Summary

• Add a Milvus integration page to the ADK integrations catalog.
• Document the Python MilvusMemoryService and MilvusToolset workflows.
• Add a Milvus catalog icon asset.

Dependency

This documentation depends on the Milvus implementation in google/adk-python-community#167.

Testing

• git diff --check
• uv run --python 3.11 --with-requirements requirements.txt mkdocs build --strict

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[zc277584121]

Hi @koverholt, this integration catalog page is ready for review when you have a chance.

It documents the Milvus support added in google/adk-python-community#167. I kept this docs PR dependent on the community PR so the page can land after the package support is accepted.

[koverholt]

Thanks for the PR and contributing this integration!

One thing to note is that most integrations/packages are hosting their integration repos/packages in their own repos, if you want to maintain full control over the release schedule and availability and unblock this integration page's review and publishing.

I'll hold off on reviewing this since it's blocked by the adk-python-community PR, or let us know if you decide to host the repo/package elsewhere and update this page accordingly.