Add plot_disp_ests()

[LuisHeinzlmeier]

• add plotDispEsts() of DESeq2
• add 1/2 plotting functions of Add variance mean plots for DGE #968
• update documentation

[LuisHeinzlmeier]

This PR was branched from PR #974 and currently contains all these changes. As soon as we merge #974, this one should be ready for a review.

I noticed that pyseq2 already has a very basic dispersion plot function, and I was wondering if I should also add the function there?

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 77.79%. Comparing base (12897e1) to head (89c1af5).
⚠️ Report is 83 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1004      +/-   ##
==========================================
+ Coverage   73.54%   77.79%   +4.24%     
==========================================
  Files          48       48              
  Lines        5613     6376     +763     
==========================================
+ Hits         4128     4960     +832     
+ Misses       1485     1416      -69     

Files with missing lines	Coverage Δ
...y/tools/_differential_gene_expression/_pydeseq2.py	91.66% <100.00%> (-0.23%)	⬇️

... and 11 files with indirect coverage changes

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[Zethson]

I noticed that pyseq2 already has a very basic dispersion plot function, and I was wondering if I should also add the function there?

No, not necessary for now.

[Zethson]

Looks great!