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## Problem gRPC client retries currently include pool acquisition under the per-attempt timeout. If pool acquisition is slow (e.g. full pool), this will cause spurious timeout warnings, and the caller will lose its place in the pool queue. Touches #11735. ## Summary of changes Makes several improvements to retries and related logic: * Don't include pool acquisition time under request timeouts. * Move attempt timeouts out of `Retry` and into the closure. * Make `Retry` configurable, move constants into main module. * Don't backoff on the first retry, and reduce initial/max backoffs to 5ms and 5s respectively. * Add `with_retries` and `with_timeout` helpers. * Add slow logging for pool acquisition, and a `warn_slow` counterpart to `log_slow`. * Add debug logging for requests and responses at the client boundary.