[Hex] Create Game class

[sotetsuk]

#1127

[codecov]

Codecov Report

Attention: Patch coverage is 98.63014% with 1 line in your changes missing coverage. Please review.

Project coverage is 80.36%. Comparing base (c343851) to head (3786fac).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
pgx/_src/games/hex.py	98.43%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1289      +/-   ##
==========================================
+ Coverage   80.34%   80.36%   +0.01%     
==========================================
  Files          62       63       +1     
  Lines        5896     5912      +16     
==========================================
+ Hits         4737     4751      +14     
- Misses       1159     1161       +2     

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