Add plugin for GROMACS

[Ericwang6]

1. Add plugin for gromacs, and relevant document and examples
2. Upgrade source/3rdparty/json.hpp to version 3.9.1

[codecov-commenter]

Codecov Report

Merging #1160 (a00b155) into devel (077df3d) will decrease coverage by 11.38%.
The diff coverage is n/a.

❗ Current head a00b155 differs from pull request most recent head 127c782. Consider uploading reports for the commit 127c782 to get more accurate results

@@             Coverage Diff             @@
##            devel    #1160       +/-   ##
===========================================
- Coverage   75.66%   64.28%   -11.39%     
===========================================
  Files          89        5       -84     
  Lines        7048       14     -7034     
===========================================
- Hits         5333        9     -5324     
+ Misses       1715        5     -1710     

Impacted Files	Coverage Δ
deepmd/cluster/__init__.py
source/op/_prod_virial_se_a_grad.py
source/op/_soft_min_virial_grad.py
deepmd/fit/dipole.py
deepmd/utils/neighbor_stat.py
deepmd/op/__init__.py
deepmd/utils/errors.py
deepmd/entrypoints/config.py
deepmd/calculator.py
source/op/_prod_virial_grad.py
... and 74 more

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[Ericwang6]

@amcadmus @njzjz I have refactored the gmx plugin code in order to compile it along with deepmd-kit. And also I have upgraded json.hpp to 3.9.1. I have closed the previous pr #1155 since it was too large to be tracked, and we may work on this pr instead. FYI @AnguseZhang @TablewareBox

[njzjz]

Looks good to me!

[njzjz]

4.9 needs to be changed to 4,8 in

https://deepmodeling--1160.org.readthedocs.build/projects/deepmd/en/1160/troubleshooting/installation.html
https://deepmodeling--1160.org.readthedocs.build/projects/deepmd/en/1160/install/install-from-source.html#install-the-tensorflow-s-c-interface

[njzjz]

These two paragraphs are inconsistent

[Ericwang6]

@AnguseZhang @TablewareBox Give a quick review?