Partially index meta-data in reports

[adelavega]

This speeds up reports significantly

[codecov-commenter]

Codecov Report

Merging #778 into master will decrease coverage by 0.03%.
The diff coverage is 71.42%.

@@            Coverage Diff             @@
##           master     #778      +/-   ##
==========================================
- Coverage   83.09%   83.06%   -0.04%     
==========================================
  Files          63       63              
  Lines        2840     2846       +6     
==========================================
+ Hits         2360     2364       +4     
- Misses        480      482       +2     

Impacted Files	Coverage Δ
neuroscout/tests/api/test_analyses.py	97.61% <0.00%> (-0.94%)	⬇️
neuroscout/tasks/utils/build.py	84.88% <100.00%> (+0.73%)	⬆️

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