Options to disable tree decomposition

[yihozhang]

This is a temporary fix for #872 and avoids future issues caused by tree decomposition by giving the user the ability to disable it.

[codecov-commenter]

Codecov Report

❌ Patch coverage is 94.28571% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 87.09%. Comparing base (dc42b8e) to head (f58a47b).

Files with missing lines	Patch %	Lines
src/ast/parse.rs	66.66%	1 Missing ⚠️
src/cli.rs	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #896      +/-   ##
==========================================
+ Coverage   87.06%   87.09%   +0.03%     
==========================================
  Files          88       88              
  Lines       25813    25840      +27     
==========================================
+ Hits        22473    22505      +32     
+ Misses       3340     3335       -5     

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