Add is_point to three_cushion ruleset

[ekiefl]

No description provided.

[ekiefl]

@erdo100 this fn should help you :)

[codecov]

Codecov Report

Attention: Patch coverage is 16.66667% with 10 lines in your changes missing coverage. Please review.

Project coverage is 44.22%. Comparing base (ab2668f) to head (0e89b7f).
Report is 3 commits behind head on main.

Files with missing lines	Patch %	Lines
pooltool/ruleset/three_cushion.py	16.66%	10 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #172      +/-   ##
==========================================
- Coverage   44.22%   44.22%   -0.01%     
==========================================
  Files         127      127              
  Lines        8551     8554       +3     
==========================================
+ Hits         3782     3783       +1     
- Misses       4769     4771       +2     

Flag	Coverage Δ
service	44.22% <16.66%> (-0.01%)	⬇️

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