Generate fast_parser.py with Schema SALAD codegen

[GlassOfWhiskey]

This commit generates a cwltool-specific parser that understands its CWL extensions. The parser inherits from those defined within the cwl-utils package, allowing to reuse utility functions.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 51.79%. Comparing base (10cabef) to head (50622f4).
⚠️ Report is 2 commits behind head on main.

❗ There is a different number of reports uploaded between BASE (10cabef) and HEAD (50622f4). Click for more details.

HEAD has 6 uploads less than BASE

Flag	BASE (10cabef)	HEAD (50622f4)
	17	11

Additional details and impacted files

@@             Coverage Diff             @@
##             main    #2252       +/-   ##
===========================================
- Coverage   85.18%   51.79%   -33.40%     
===========================================
  Files          46       47        +1     
  Lines        8591    10243     +1652     
  Branches     2011     2356      +345     
===========================================
- Hits         7318     5305     -2013     
- Misses        807     4416     +3609     
- Partials      466      522       +56     

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