core: move identifier parsing to lexer

[math-fehr]

No description provided.

[codecov]

Codecov Report

Patch coverage: 92.74% and project coverage change: -0.11 ⚠️

Comparison is base (59a2b58) 86.81% compared to head (0e7a6cb) 86.71%.

❗ Current head 0e7a6cb differs from pull request most recent head 6242a45. Consider uploading reports for the commit 6242a45 to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1072      +/-   ##
==========================================
- Coverage   86.81%   86.71%   -0.11%     
==========================================
  Files         130      130              
  Lines       20399    20417      +18     
  Branches     3085     3092       +7     
==========================================
- Hits        17709    17704       -5     
- Misses       2182     2204      +22     
- Partials      508      509       +1     

Impacted Files	Coverage Δ
xdsl/dialects/builtin.py	82.95% <50.00%> (-0.96%)	⬇️
xdsl/parser.py	84.92% <93.63%> (-0.65%)	⬇️
tests/test_parser.py	100.00% <100.00%> (ø)
xdsl/dialects/func.py	95.75% <100.00%> (ø)
xdsl/dialects/riscv.py	84.74% <100.00%> (-0.03%)	⬇️

... and 13 files with indirect coverage changes

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