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Blueprint for handling Gitaly upload-pack traffic in a HTTP/2 server

Quang-Minh Nguyen requested to merge qmnguyen0711/add-gitlay-handle-upload-pack-in-pure-http2-server into master

This MR adds blueprint for handling Gitaly upload-pack traffic in a pure HTTP/2 server.

I implemented two POC merge requests in Gitaly and Workhorse to demonstrate the proposed solution. This POC makes the tests green for non-Praefect setup. The early benchmarks on the local environment show that this approach is slightly faster than the Sidechannel approach. It reduces peak CPU consumption by 10-20% and maintains the same memory utilization. The POC is not complete, but it shows the simplification using "boring" techniques.

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