refactor configurations

[wanghan-iapcm]

• new module conf is provided.
• create abstract base class conf.ConfGenerator
• all the configuration definitions are derived from the conf.ConfGenerator
• examples of conf.AlloyConfGenerator and conf.FileConfGenerator are provided. The former generate alloy configurations, and the latter generates confs from files.

[codecov-commenter]

Codecov Report

Base: 71.81% // Head: 80.94% // Increases project coverage by +9.12% 🎉

Coverage data is based on head (fe3265d) compared to base (db4ea65).
Patch coverage: 94.39% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #103      +/-   ##
==========================================
+ Coverage   71.81%   80.94%   +9.12%     
==========================================
  Files          65       68       +3     
  Lines        2743     2829      +86     
==========================================
+ Hits         1970     2290     +320     
+ Misses        773      539     -234     

Impacted Files	Coverage Δ
dpgen2/conf/unit_cells.py	99.15% <ø> (ø)
dpgen2/entrypoint/common.py	56.09% <ø> (+36.58%)	⬆️
dpgen2/utils/__init__.py	100.00% <ø> (ø)
dpgen2/entrypoint/submit.py	17.11% <33.33%> (+17.11%)	⬆️
dpgen2/conf/conf_generator.py	93.75% <93.75%> (ø)
dpgen2/conf/__init__.py	100.00% <100.00%> (ø)
dpgen2/conf/alloy_conf.py	86.79% <100.00%> (ø)
dpgen2/conf/file_conf.py	100.00% <100.00%> (ø)
dpgen2/entrypoint/args.py	90.43% <100.00%> (+68.93%)	⬆️
... and 6 more

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