feat: add new community maintained ADK client SDKs

[bih]

We're using ADK pretty heavily and really enjoying using it compared to other agent frameworks. As we've been exploring productionizing some of these prototypes, we've needed some reliable SDKs for communicating with the FastAPI endpoints provided by either adk web or adk api_server.

This adds a section containing the TypeScript / Node.js client we created based on the OpenAPI specification with a bit of idomatic styling. We plan on adding a bunch of clients in other languages, such as Python and Java and I'm sure the community can add others.

Thanks for all the hard work you're doing with ADK. Let me know if there's any changes we should make to better suit the information architecture you already have for the ADK docs!

[google-cla]

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[lavinigam-gcp]

@bih Hi Bilawal, thank you for raising the PR. I would like you to move the content to the following section:

https://google.github.io/adk-docs/community/ and more specifically this location: https://github.com/google/adk-docs/blob/main/docs/community.md

You can add a section: “Community Tools” and then add your tool.