Enable tox in CI

[michalk8]

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Title

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• New feature (non-breaking change which adds functionality)

Description

Enable tox in CI.

How has this been tested?

Have release notes been modified?

Closes

closes #675

[codecov]

Codecov Report

Merging #713 (6fffd05) into dev (2ca440a) will decrease coverage by 6.71%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##              dev     #713      +/-   ##
==========================================
- Coverage   88.32%   81.60%   -6.72%     
==========================================
  Files          71       59      -12     
  Lines        8770     8705      -65     
  Branches        0     1765    +1765     
==========================================
- Hits         7746     7104     -642     
+ Misses       1024     1022       -2     
- Partials        0      579     +579     

Impacted Files	Coverage Δ
cellrank/pl/_graph.py	71.05% <0.00%> (-13.60%)	⬇️
cellrank/tl/estimators/_cflare.py	68.36% <0.00%> (-12.25%)	⬇️
cellrank/tl/kernels/_pseudotime_kernel.py	75.71% <0.00%> (-11.43%)	⬇️
cellrank/tl/estimators/_property.py	73.81% <0.00%> (-11.43%)	⬇️
cellrank/settings/_settings.py	80.00% <0.00%> (-10.00%)	⬇️
cellrank/tl/estimators/_gpcca.py	77.73% <0.00%> (-9.67%)	⬇️
cellrank/tl/estimators/_base_estimator.py	77.33% <0.00%> (-9.57%)	⬇️
cellrank/pl/_log_odds.py	78.78% <0.00%> (-9.10%)	⬇️
cellrank/tl/kernels/_base_kernel.py	78.51% <0.00%> (-9.03%)	⬇️
cellrank/pl/_cluster_lineage.py	81.73% <0.00%> (-8.70%)	⬇️
... and 48 more

[Marius1311]

Nice, great that this is finally done!