Add new datasets, and update feature schema for RMS

[adelavega]

Ingest StructuredNarrative / ds001510 dataset.
Also sets up TwilightZone for ingestion, but stimulus questions are holding that up.

[codecov-io]

Codecov Report

Merging #638 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #638   +/-   ##
=======================================
  Coverage   82.22%   82.22%           
=======================================
  Files          57       57           
  Lines        2183     2183           
=======================================
  Hits         1795     1795           
  Misses        388      388

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