remove pybind submodule

[clonker]

and rely on pyproject.toml metadata

[codecov]

Codecov Report

Merging #1556 (0984c57) into devel (192df9c) will decrease coverage by 0.04%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##            devel    #1556      +/-   ##
==========================================
- Coverage   91.93%   91.88%   -0.05%     
==========================================
  Files         229      229              
  Lines       26629    26629              
==========================================
- Hits        24481    24468      -13     
- Misses       2148     2161      +13     

Impacted Files	Coverage Δ
pyemma/msm/tests/test_its.py	99.44% <100.00%> (ø)
pyemma/_base/estimator.py	81.48% <0.00%> (-6.35%)	⬇️
pyemma/_ext/sklearn/base.py	62.12% <0.00%> (-0.76%)	⬇️

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