Refact configuration selection

[wanghan-iapcm]

This PR refactor the configuration selection of dpgen2. Some key changes are

• TrajRender to render the trajectory and model deviation of exploration output.
• ExplorationReportTrustLevels provides the rules of configuration selection. It
  1. analyzes the model deviation
  2. tells which frames are selected
  3. supports summary printing
• ExplorationReportTrustLevels does not depend on the format of trajectory and model deviation
• ConfSelectorLammpsFrames -> ConfSelectorFrames uses render and report to select configurations from trajectories. Its implementation also does not depend on the format of trajectory and model deviation.

[njzjz]

@wanghan-iapcm It seems that the tests hang

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 93.57143% with 9 lines in your changes missing coverage. Please review.

Project coverage is 80.63%. Comparing base (9a722c1) to head (75197ee). Report is 127 commits behind head on master.

Files	Patch %	Lines
dpgen2/entrypoint/submit.py	40.00%	3 Missing :warning:
dpgen2/exploration/render/traj_render.py	80.00%	3 Missing :warning:
dpgen2/exploration/report/report.py	86.66%	2 Missing :warning:
dpgen2/exploration/render/traj_render_lammps.py	97.14%	1 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #109 +/- ## ========================================== - Coverage 81.08% 80.63% -0.46% ========================================== Files 69 72 +3 Lines 2903 2980 +77 ========================================== + Hits 2354 2403 +49 - Misses 549 577 +28 ```

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[wanghan-iapcm]

@njzjz ready for review