Remove sys.getdxp() and Tools/scripts/analyze_dxp.py: superceded by Py_STATS infra

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In Python 3.10/3.11, the old DYNAMIC_EXECUTION_PROFILE and DXPAIRS macros were replaced with Py_STATS macro. The sys.getdxp() function is no longer used with Tools/scripts/analyze_dxp.py. Now if Python is built with ./configure --enable-pystats, statistics on opcodes are written into the /tmp/py_stats/ directory and these files can be analyzed with Tools/scripts/summarize_stats.py.

I propose to remove sys.getdxp() and Tools/scripts/analyze_dxp.py.

[mdboom]

Cc: @markshannon

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Fixed by 116fa62