Add connect3

[YiwenAI]

Description

Add connect3

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)

Checklist

• I have ensured make test pass (required).
• I have checked the code using make format (required).

[codecov]

Codecov Report

Merging #115 (94a8122) into main (f6cd283) will increase coverage by 0.41%.
The diff coverage is 78.44%.

@@            Coverage Diff             @@
##             main     #115      +/-   ##
==========================================
+ Coverage   45.26%   45.67%   +0.41%     
==========================================
  Files         153      155       +2     
  Lines        9706     9822     +116     
==========================================
+ Hits         4393     4486      +93     
- Misses       5313     5336      +23     

Flag	Coverage Δ
unittests	45.67% <78.44%> (+0.41%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
openrl/envs/connect3/connect3_env.py	76.19% <76.19%> (ø)
openrl/envs/connect3/__init__.py	100.00% <100.00%> (ø)

... and 1 file with indirect coverage changes

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