lib,src,doc: add --heapsnapshot-signal CLI flag
This flag allows heap snapshots to be captured without modifying application code. IMO, this is a big part of the "heapdump in core" use case.
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