Simple initial rate limiting implementation

[rbren]

End-user friendly description of the problem this fixes or functionality that this introduces

• Include this change in the Release Notes. If checked, you must provide an end-user friendly description for your change below
  CHANGELOG: put some liberal rate limiting in place

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Give a summary of what the PR does, explaining any non-trivial design decisions

This is a foot in the door to rate limiting. More robust, per-route rate limiting will be easier with some refactoring

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Link of any specific issues this addresses

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To run this PR locally, use the following command:

docker run -it --rm   -p 3000:3000   -v /var/run/docker.sock:/var/run/docker.sock   --add-host host.docker.internal:host-gateway   -e SANDBOX_RUNTIME_CONTAINER_IMAGE=docker.all-hands.dev/all-hands-ai/runtime:df4db0a-nikolaik   --name openhands-app-df4db0a   docker.all-hands.dev/all-hands-ai/openhands:df4db0a

[tofarr]

🍰 - if needed, once we have the redis integrated we could think about that as an alternative to in memory