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doc: Add debugging tips? #1690

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@eacousineau

Doing a quick search of "debugging" doesn't bring up too much in the pybind11 docs.

For the repo that I work on, we've found it useful to document some debugging tips that are relevant to Python C extensions:
https://drake.mit.edu/python_bindings.html#debugging-with-the-python-bindings

Perhaps some mention of using trace, perhaps a small example with GDB would go a long ways?
For GDB, it'd be nice to show (a) debugging a module and (b) debugging a C++ binary with an embedded interpreter.
I find that for hacking directly on pybind11 (in things like #1325 and #1146), it's uber useful to plop into Python via an embedded interpreter, rather than debugging through the python executable itsefl.

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