Simplify code structure

[findmyway]

• Rename API.

  • Remove get_ prefix.
  • get_terminal -> is_terminated
  • actions -> action_space
  • state_space

• Move RandomPolicy to RLCore

• Move environment wrapper to RLEnvs

• Add examples to demonstrate how to write customized environments.

• Test CommonRLInterfaces

[codecov-io]

Codecov Report

❗ No coverage uploaded for pull request base (master@e05fefe). Click here to learn what that means.
The diff coverage is n/a.

@@            Coverage Diff            @@
##             master     #107   +/-   ##
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  Coverage          ?   78.75%           
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  Files             ?       14           
  Lines             ?      626           
  Branches          ?        0           
=========================================
  Hits              ?      493           
  Misses            ?      133           
  Partials          ?        0           

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