Additional metricsport stats for various stages of onionservice handshake

If we export additional onion service metrics such as time measurements on the HSDIR, INTRO, and REND stages of circuit setup for both client and service side, and the number of timeouts/failures there, it would help to uncover the root cause of issues like #40570 (closed) and related reliability and connectivity issues with onion services.

We can also export congestion control info from #40708 (closed) to the onionservice metrics set, too, which can help us with tuning congestion control for onion services.

We can then hook up the onionperf onion service instances to our grafana dashboard, and gather more detailed stats that way, as a supplement to the metrics that get graphed on the metrics website.