Add support for six new key-value pairs added by OnionPerf
OnionPerf adds six new key-value pairs to the .tpf format that Torperf/CollecTor did not produce: ENDPOINTLOCAL, ENDPOINTPROXY, ENDPOINTREMOTE, HOSTNAMELOCAL, HOSTNAMEREMOTE, and SOURCEADDRESS. We should add support for these keys to metrics-lib, so that we can start using their values.
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