Faster JSONL Loading

[armandmcqueen]

New PR for clean commit history

Picking up from #1445

[codecov-io]

Codecov Report

Merging #1480 into master will increase coverage by 0.04%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #1480      +/-   ##
==========================================
+ Coverage   86.87%   86.92%   +0.04%     
==========================================
  Files          27       27              
  Lines        3582     3594      +12     
==========================================
+ Hits         3112     3124      +12     
  Misses        470      470

Impacted Files	Coverage Δ
quilt3/packages.py	91.29% <0%> (+0.15%)	⬆️

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