[CI] Add pytest-testmon to reduce testing time

[kozistr]

Problem (Why?)

only to run needed tests, not the whole cases.

Solution (What/How?)

• add pytest-testmon

Other changes (bug fixes, small refactors)

nope

Notes

nope

[codecov-commenter]

Codecov Report

Merging #87 (fd53a85) into main (534a0f4) will decrease coverage by 96.30%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##             main     #87       +/-   ##
==========================================
- Coverage   96.30%   0.00%   -96.31%     
==========================================
  Files          31      31               
  Lines        2218    2218               
==========================================
- Hits         2136       0     -2136     
- Misses         82    2218     +2136     

Impacted Files	Coverage Δ
pytorch_optimizer/__init__.py	0.00% <0.00%> (-100.00%)	⬇️
pytorch_optimizer/base/types.py	0.00% <0.00%> (-100.00%)	⬇️
pytorch_optimizer/optimizer/gc.py	0.00% <0.00%> (-100.00%)	⬇️
pytorch_optimizer/optimizer/agc.py	0.00% <0.00%> (-100.00%)	⬇️
pytorch_optimizer/optimizer/adan.py	0.00% <0.00%> (-100.00%)	⬇️
pytorch_optimizer/optimizer/lamb.py	0.00% <0.00%> (-100.00%)	⬇️
pytorch_optimizer/optimizer/lars.py	0.00% <0.00%> (-100.00%)	⬇️
pytorch_optimizer/optimizer/sgdp.py	0.00% <0.00%> (-100.00%)	⬇️
pytorch_optimizer/optimizer/adamp.py	0.00% <0.00%> (-100.00%)	⬇️
pytorch_optimizer/optimizer/madgrad.py	0.00% <0.00%> (-100.00%)	⬇️
... and 21 more

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