add raw string support

[subbyte]

No description provided.

[codecov]

Codecov Report

Patch coverage: 95.65% and project coverage change: -0.04 ⚠️

Comparison is base (13c21fc) 83.72% compared to head (b0a98de) 83.69%.

❗ Current head b0a98de differs from pull request most recent head 13cba84. Consider uploading reports for the commit 13cba84 to get more accurate results

Additional details and impacted files

@@             Coverage Diff             @@
##           develop     #329      +/-   ##
===========================================
- Coverage    83.72%   83.69%   -0.04%     
===========================================
  Files           42       42              
  Lines         2894     2894              
===========================================
- Hits          2423     2422       -1     
- Misses         471      472       +1     

Impacted Files	Coverage Δ
src/kestrel/syntax/parser.py	97.20% <95.00%> (-0.37%)	⬇️
src/kestrel/utils.py	96.29% <100.00%> (+0.14%)	⬆️

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[pcoccoli]

Looks good