Add time benchmark in docs & enable batched_operation of sinkhorn in rrwm

[codecov[bot]]

Codecov Report

Merging #72 (92d9fd5) into main (b6e4dd1) will decrease coverage by 0.02%. Report is 1 commits behind head on main. The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main      #72      +/-   ##
==========================================
- Coverage   92.89%   92.88%   -0.02%     
==========================================
  Files          20       20              
  Lines        7586     7586              
==========================================
- Hits         7047     7046       -1     
- Misses        539      540       +1     

Files Changed	Coverage Δ
pygmtools/neural_solvers.py	88.62% <ø> (ø)
pygmtools/jittor_backend.py	96.46% <100.00%> (-0.12%)	:arrow_down:
pygmtools/mindspore_backend.py	90.34% <100.00%> (ø)
pygmtools/numpy_backend.py	97.10% <100.00%> (ø)
pygmtools/paddle_backend.py	96.70% <100.00%> (ø)
pygmtools/pytorch_backend.py	94.91% <100.00%> (ø)
pygmtools/tensorflow_backend.py	95.35% <100.00%> (ø)

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[rogerwwww]

Good job. Merged.