redirect print_summary to LAMMPS log

[njzjz]

This commit redirects print_summary output to LAMMPS log function, so
it will be also shown in log.lammps.

[codecov-commenter]

Codecov Report

Merging #1324 (8931f04) into devel (6ce4225) will decrease coverage by 11.29%.
The diff coverage is n/a.

@@             Coverage Diff             @@
##            devel    #1324       +/-   ##
===========================================
- Coverage   75.58%   64.28%   -11.30%     
===========================================
  Files          91        5       -86     
  Lines        7503       14     -7489     
===========================================
- Hits         5671        9     -5662     
+ Misses       1832        5     -1827     

Impacted Files	Coverage Δ
source/op/_prod_force_grad.py
deepmd/descriptor/descriptor.py
deepmd/entrypoints/doc.py
deepmd/entrypoints/train.py
deepmd/utils/random.py
deepmd/cluster/__init__.py
deepmd/utils/type_embed.py
deepmd/model/__init__.py
deepmd/loss/__init__.py
source/op/_gelu.py
... and 76 more

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