move deepmd.entrypoints.{doc,gui} to deepmd_utils.entrypoints.{doc,gui}

[njzjz]

See #3118

[codecov]

Codecov Report

Attention: 11 lines in your changes are missing coverage. Please review.

Comparison is base (2096b80) 76.23% compared to head (1d53255) 76.24%.

Files	Patch %	Lines
deepmd_utils/entrypoints/doc.py	40.00%	6 Missing ⚠️
deepmd_utils/entrypoints/gui.py	28.57%	5 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##            devel    #3144   +/-   ##
=======================================
  Coverage   76.23%   76.24%           
=======================================
  Files         267      269    +2     
  Lines       25424    25428    +4     
  Branches     1579     1579           
=======================================
+ Hits        19383    19387    +4     
  Misses       5116     5116           
  Partials      925      925           

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