MAINT: move CheckM action to a brand new plugin (q2-checkm)

[misialq]

This PR removes CheckM action, as discussed in #13. The action will now live in its own plugin: bokulich-lab/q2-checkm#1.

Closes #14.

[codecov]

Codecov Report

Merging #17 (dd89972) into main (e3c65de) will increase coverage by 2.93%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main      #17      +/-   ##
==========================================
+ Coverage   94.21%   97.15%   +2.93%     
==========================================
  Files          18       10       -8     
  Lines         588      281     -307     
==========================================
- Hits          554      273     -281     
+ Misses         34        8      -26     

Impacted Files	Coverage Δ
q2_moshpit/plugin_setup.py	100.00% <ø> (ø)
q2_moshpit/__init__.py	100.00% <100.00%> (ø)
q2_moshpit/_utils.py	95.23% <0.00%> (-4.77%)	⬇️

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