[ConnectFour] Separate game specific methods

[sotetsuk]

1127

[codecov[bot]]

Codecov Report

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

Comparison is base (1f18c3c) 88.07% compared to head (89a374a) 88.10%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #1152 +/- ## ========================================== + Coverage 88.07% 88.10% +0.03% ========================================== Files 63 63 Lines 5979 5996 +17 ========================================== + Hits 5266 5283 +17 Misses 713 713 ```

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