Refactor regex builtin character-class identifiers

[davidwendt]

Refactors the builtin regex class integer ids to common header for the compiler and executor.
The builtin regex character classes like \s, \d, \W have integer identifiers (bit values that can be combined) but were defined in separate source files. This PR refactors the declarations to the common header file regcomp.h to ensure the same value is used when parsing/compiling the instructions in regcomp.cpp and when evaluating the instructions in regex.inl.

This is just a cleanup of the code and does not effect behavior or performance.

[codecov]

Codecov Report

Merging #10814 (60dcc65) into branch-22.06 (8d861ce) will decrease coverage by 0.10%.
The diff coverage is 96.49%.

@@               Coverage Diff                @@
##           branch-22.06   #10814      +/-   ##
================================================
- Coverage         86.40%   86.30%   -0.11%     
================================================
  Files               143      144       +1     
  Lines             22448    22629     +181     
================================================
+ Hits              19396    19529     +133     
- Misses             3052     3100      +48     

Impacted Files	Coverage Δ
python/cudf/cudf/core/frame.py	93.41% <ø> (ø)
python/cudf/cudf/core/indexed_frame.py	91.70% <ø> (ø)
python/cudf/cudf/core/dataframe.py	93.77% <96.29%> (+0.08%)	⬆️
python/cudf/cudf/testing/_utils.py	94.05% <100.00%> (+0.06%)	⬆️
...thon/dask_cudf/dask_cudf/tests/test_distributed.py	18.86% <0.00%> (-67.93%)	⬇️
python/cudf/cudf/io/parquet.py	90.47% <0.00%> (-2.23%)	⬇️
python/dask_cudf/dask_cudf/backends.py	85.51% <0.00%> (-0.94%)	⬇️
python/cudf/cudf/core/column/categorical.py	89.37% <0.00%> (-0.61%)	⬇️
python/cudf/cudf/core/column/decimal.py	90.60% <0.00%> (-0.50%)	⬇️
python/cudf/cudf/core/column/lists.py	91.66% <0.00%> (-0.42%)	⬇️
... and 17 more

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[bdice]

A few small suggestions attached. Otherwise LGTM!

[davidwendt]

@gpucibot merge