[internal] grpc_util: add layer to capture network-level timing data (Cherry-pick of #15978) #15999
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Our REAPI client uses
concurrency_limit
to ensure only a certain maximum number of client calls run concurrently. This causes any timing metrics computed outside of that concurrency limit to include the queuing time in addition to the actual network RPC time.This PR defines a layer below the concurrency limit that will capture just the network RPC time. Timings are captured based on the URI path which maps to a specific observation metric. Units are microseconds.