C# server performance improvements #6498
Merged
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Based on #6462.
A bit of basic performance work.
-- avoid an extra thread switch when handling call on server.
-- fix C# qps worker to not allocate dedicated threads for async client (that has a huge impact - when we request creation of 64*100 dedicated threads in unconstrained scenario, the throughput drops 10x).
-- expose experimental api to set GrpcThreadPool size (and autocompute the default size based on number of cores)
-- remove an unnecessary locks