use bit operations to construct nbor sort keys

[denghuilu]

Changes

• use bit operations to construct nbor sort keys;
• set unsigned long long as uint_64 instead of int_64;
• add gpu fmt_nlist unit tests;
• fix a bug of MD inference which may cause the program to crash, see running error on gpu_cuda.h #533

[denghuilu]

changes

• add ut for encoding/decoding nbor info

[codecov-commenter]

Codecov Report

Merging #545 (58e83ae) into devel (4b5e916) will decrease coverage by 0.05%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##            devel     #545      +/-   ##
==========================================
- Coverage   62.15%   62.09%   -0.06%     
==========================================
  Files          74       74              
  Lines        6220     6229       +9     
==========================================
+ Hits         3866     3868       +2     
- Misses       2354     2361       +7     

Impacted Files	Coverage Δ
deepmd/utils/argcheck.py	16.54% <0.00%> (-0.13%)	⬇️
deepmd/loss/tensor.py	32.53% <0.00%> (+0.53%)	⬆️

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