New Chapman-Kolmogorov test implementation

[clonker]

and some smaller improvements

[codecov]

Codecov Report

Merging #202 (85a9574) into main (b49043b) will increase coverage by 0.13%.
The diff coverage is 95.02%.

@@            Coverage Diff             @@
##             main     #202      +/-   ##
==========================================
+ Coverage   93.63%   93.76%   +0.13%     
==========================================
  Files         134      136       +2     
  Lines       10644    10790     +146     
==========================================
+ Hits         9966    10117     +151     
+ Misses        678      673       -5     

Impacted Files	Coverage Δ
deeptime/data/_bickley_simulator.py	98.86% <ø> (ø)
deeptime/data/_pbf_simulator.py	100.00% <ø> (ø)
deeptime/base.py	94.70% <75.00%> (-2.35%)	⬇️
deeptime/decomposition/_koopman.py	90.07% <80.00%> (-1.53%)	⬇️
deeptime/decomposition/_score.py	93.49% <83.33%> (-0.63%)	⬇️
deeptime/plots/chapman_kolmogorov.py	93.87% <93.87%> (+93.87%)	⬆️
deeptime/util/decorators.py	93.65% <97.14%> (+3.65%)	⬆️
deeptime/util/validation.py	97.50% <97.50%> (ø)
deeptime/markov/_observables.py	98.00% <98.00%> (ø)
deeptime/data/_drunkards_walk_simulator.py	95.37% <100.00%> (ø)
... and 20 more

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