Support core dump analysis with pystack.

[tvalentyn]

Support analyzing core files with pystack when python SDK processes crash with segfaults.

Currently this should work with Dataflow from Beam 2.76.0 but should be possible to extend support to other runners.

Sample usage:

python my_pipeline.py --runner=DataflowRunner --profiler_agent=pystack_coredump --profiler_extra_arg="--native" --profile_postprocess_interval_sec=30

For more information, see: https://bloomberg.github.io/pystack/ and pystack --help .

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