add selfplay strategy

[huangshiyu13]

Description

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 #182 (c2f80c1) into main (8de57fe) will not change coverage.
Report is 1 commits behind head on main.
The diff coverage is 0.00%.

❗ Current head c2f80c1 differs from pull request most recent head 2d2f4a0. Consider uploading reports for the commit 2d2f4a0 to get more accurate results

@@          Coverage Diff          @@
##            main    #182   +/-   ##
=====================================
  Coverage   0.00%   0.00%           
=====================================
  Files        219     223    +4     
  Lines      12544   12620   +76     
=====================================
- Misses     12544   12620   +76     

Flag	Coverage Δ
unittests	0.00% <0.00%> (ø)

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

Files Changed	Coverage Δ
openrl/__init__.py	0.00% <0.00%> (ø)
openrl/selfplay/callbacks/selfplay_api.py	0.00% <0.00%> (ø)
openrl/selfplay/sample_strategy/__init__.py	0.00% <0.00%> (ø)
...l/selfplay/sample_strategy/base_sample_strategy.py	0.00% <0.00%> (ø)
openrl/selfplay/sample_strategy/last_opponent.py	0.00% <0.00%> (ø)
openrl/selfplay/sample_strategy/random_opponent.py	0.00% <0.00%> (ø)
openrl/selfplay/selfplay_api/base_api.py	0.00% <0.00%> (ø)
openrl/selfplay/selfplay_api/selfplay_api.py	0.00% <0.00%> (ø)
openrl/selfplay/selfplay_api/selfplay_client.py	0.00% <0.00%> (ø)
openrl/utils/callbacks/callbacks_factory.py	0.00% <0.00%> (ø)

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