remove unnecessary files from pypi source distribution

[njzjz]

Our PyPi source distribution package is over 30MB which is too large! See https://pypi.org/project/deepmd-kit/2.2.2/#files
By default, when using setuptools-scm, all files will be added to the package. This PR excludes directories that are not used for building and installing, including:

• source/tests
• source/api_c/tests
• source/api_cc/tests
• source/lib/tests
• source/lmp/tests
• doc
• examples
• data
• .github

After removing these files from the source distribution, the package is only 708 KB.

[codecov]

Codecov Report

Patch coverage has no change and project coverage change: +0.01 🎉

Comparison is base (275ad5f) 76.80% compared to head (c29e21e) 76.82%.

Additional details and impacted files

@@            Coverage Diff             @@
##            devel    #2565      +/-   ##
==========================================
+ Coverage   76.80%   76.82%   +0.01%     
==========================================
  Files         227      227              
  Lines       23805    23805              
  Branches     1653     1653              
==========================================
+ Hits        18284    18287       +3     
  Misses       4421     4421              
+ Partials     1100     1097       -3     

see 2 files with indirect coverage changes

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