[Experimental] Add torch implementation of Go

[sotetsuk]

After naive translation, I fixed

• ZeroDivisionError
• select/cond to GameState: _remove_stones, _merge_chain, _apply_action

To make torch.vmap(step) work

• [ ] fix _apply_action
• [ ] remove while_loop

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 80.73%. Comparing base (dc9e754) to head (82edc5b). Report is 71 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1205   +/-   ##
=======================================
  Coverage   80.73%   80.73%           
=======================================
  Files          61       61           
  Lines        5980     5980           
=======================================
  Hits         4828     4828           
  Misses       1152     1152           

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