allowed partial matches in pattern matching

[joshqwang]

instead of let (a,b,(c,d)) = (1,2,?) in a resulting in an indeterminate match, it now allows a and b to match to 1 and 2.

[codecov]

Codecov Report

❌ Patch coverage is 48.42767% with 82 lines in your changes missing coverage. Please review.
✅ Project coverage is 49.84%. Comparing base (72e8d10) to head (190d592).
⚠️ Report is 258 commits behind head on dev.

Files with missing lines	Patch %	Lines
src/language/dynamics/Substitution.re	0.00%	55 Missing ⚠️
src/language/dynamics/transition/Transition.re	55.55%	16 Missing ⚠️
src/language/dynamics/transition/PatternMatch.re	83.82%	11 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##              dev    #1910      +/-   ##
==========================================
- Coverage   49.97%   49.84%   -0.13%     
==========================================
  Files         200      200              
  Lines       21278    21421     +143     
==========================================
+ Hits        10633    10678      +45     
- Misses      10645    10743      +98     

Files with missing lines	Coverage Δ
src/language/dynamics/transition/PatternMatch.re	81.66% <83.82%> (ø)
src/language/dynamics/transition/Transition.re	69.47% <55.55%> (-1.68%)	⬇️
src/language/dynamics/Substitution.re	26.13% <0.00%> (-16.02%)	⬇️

... and 9 files with indirect coverage changes

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