Query "masks" section of io_spec.json in collect_derivatives

[tsalo]

Closes #509. This adds a step in collect_derivatives to collect queries from the "masks" section of the io_spec.json.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 74.74%. Comparing base (c554cf0) to head (e6d0f43).
⚠️ Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #511      +/-   ##
==========================================
+ Coverage   70.63%   74.74%   +4.11%     
==========================================
  Files          25       25              
  Lines        2077     2083       +6     
  Branches      270      272       +2     
==========================================
+ Hits         1467     1557      +90     
+ Misses        552      457      -95     
- Partials       58       69      +11     

Flag	Coverage Δ
ds054	44.70% <ø> (?)

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[effigies]

Edit: I decided what I was saying was stupid, so instead of deleting it, I just hit "post".