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This PR introduces a new testonly endpoint for introspecting the RequestLimiter state. It makes use of the endpoint to verify that changes to the request_limiter config are honored across reload. In the future, we may choose to make the sys/internal/request-limiter/status endpoint available in normal binaries, but this is an expedient way to expose the status for testing without having to rush the design. In order to re-use as much of the existing command package utility funcionality as possible without introducing sprawling code changes, I introduced a new server_util.go and exported some fields via accessors. The tests shook out a couple of bugs (including a deadlock and lack of locking around the core limiterRegistry state).