rename deepmd_cli to deepmd_utils

[njzjz]

Preparation for more methods in the deepmd_utils package. (deepmd_cli is not a good name for this usage)

Enable documentation for the deepmd_utils package.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (283e8fe) 75.26% compared to head (85af19a) 75.26%.

Additional details and impacted files

@@           Coverage Diff           @@
##            devel    #2983   +/-   ##
=======================================
  Coverage   75.26%   75.26%           
=======================================
  Files         245      245           
  Lines       24669    24670    +1     
  Branches     1593     1593           
=======================================
+ Hits        18566    18567    +1     
  Misses       5167     5167           
  Partials      936      936           

Files	Coverage Δ
deepmd/__init__.py	86.36% <100.00%> (ø)
deepmd/entrypoints/main.py	73.33% <100.00%> (ø)
deepmd_utils/__init__.py	100.00% <100.00%> (ø)
deepmd_utils/main.py	98.05% <100.00%> (ø)

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