http2: add ping event
Add a Http2Session
event whenever a non-ack PING
is received.
Fixes: https://github.com/nodejs/node/issues/18514
/cc @murgatroid99 who requested the feature
/cc @nodejs/http2
Checklist
-
make -j4 test
(UNIX), orvcbuild test
(Windows) passes -
tests and/or benchmarks are included -
documentation is changed or added -
commit message follows commit guidelines