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frontend-grpc: limit the number of request processing threads

Tigran Mkrtchyan requested to merge 318-fix-grpc-frontend-threads into main


if a large number of requests are submitted to CTA, then frontend will spawn too many threads that eventually 'kill' the service.

This change introduces a thread number limit, which defaults to 8xCPUs, if not explicitly defined during the start.

Requires manual tests in pre-production


Closes #318 (closed)

It would be nice to get this change backport into 5.7 branch

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