ENH: Busco main plot. Bars with constant height.

[Sann5]

Closes #78

• Controls the height of the plot by assigning a constant height to each bar.
• Controls the vertical spacing between subgraphs.
• Adjusts tests and calls to this function accordingly.

[codecov]

Codecov Report

Merging #80 (79047f4) into main (70afdfa) will increase coverage by 0.00%.
Report is 1 commits behind head on main.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main      #80   +/-   ##
=======================================
  Coverage   97.58%   97.58%           
=======================================
  Files          32       32           
  Lines        1945     1947    +2     
=======================================
+ Hits         1898     1900    +2     
  Misses         47       47           

Files	Coverage Δ
q2_moshpit/busco/tests/test_utils.py	95.31% <ø> (ø)
q2_moshpit/busco/utils.py	100.00% <ø> (ø)

... and 1 file with indirect coverage changes

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[misialq]

Exactly what I had in mind - thanks! 🚀