gh-127443: add tool for linting Doc/data/refcounts.dat

[picnixz]

This tool can be used as follows:

python3.12 Tools/refcounts/lint.py  Doc/data/refcounts.dat
python3.12 Tools/refcounts/lint.py  Doc/data/refcounts.dat --abi Misc/stable_abi.toml

With the current file, I have something like: (three were missing in #127451, my bad, so I fixed them as well)

----------------------------------- PARSING ------------------------------------
----------------------------------- CHECKING -----------------------------------
  643  PyErr_NormalizeException[exc]                      missing reference count management
  644  PyErr_NormalizeException[val]                      missing reference count management
  645  PyErr_NormalizeException[tb]                       missing reference count management

Found 3 issues
Entries are not sorted

When I also include the stable ABI file, I have in addition (output truncated)

Found 3 issues
Entries are not sorted
----------------------------- CHECKING STABLE ABI ------------------------------
Stable ABI file: /home/picnix/lib/python/cpython/Misc/stable_abi.toml

Missing 232 stable ABI entries:
PyArg_Parse
PyArg_ParseTuple
PyArg_ParseTupleAndKeywords
PyArg_UnpackTuple
PyArg_VaParse
PyArg_VaParseTupleAndKeywords
PyArg_ValidateKeywordArguments
PyBuffer_FromContiguous
[...]

• Issue: Improve and maintain Doc/data/refcounts.dat #127443

[AlexWaygood]

Nice. I haven't reviewed the script as I know nothing about the refcounts.dat file, but the lint configs LGTM.

[picnixz]

I don't think I'll change the configs. So thanks Alex for your review (and sorry for the request, I misclicked)! Now, I'll wait for Peter and Kirill's reviews concerning the script itself.