Add the ability to restructure testcases into subdirectories

[FollowTheProcess]

Summary

[codecov]

Codecov Report

❌ Patch coverage is 41.66667% with 7 lines in your changes missing coverage. Please review.
✅ Project coverage is 79.3%. Comparing base (4963205) to head (9e73a90).
⚠️ Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
internal/syntax/syntaxtest/syntaxtest.go	41.6%	4 Missing and 3 partials ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##            main    #151     +/-   ##
=======================================
- Coverage   79.6%   79.3%   -0.3%     
=======================================
  Files         27      27             
  Lines       1918    1930     +12     
=======================================
+ Hits        1527    1532      +5     
- Misses       292     296      +4     
- Partials      99     102      +3     

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