http2: add Http2Session.lastReceivedTime
Adds a time stamp indicating the last time data was received from the connected peer.
Fixes: https://github.com/nodejs/node/issues/21730
/cc @murgatroid99 who requested the feature /cc @nodejs/http2
Checklist
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make -j4 test
(UNIX), orvcbuild test
(Windows) passes -
tests and/or benchmarks are included -
documentation is changed or added -
commit message follows commit guidelines