Provide bin/nuance import and ngram indexes for sources
Ref T10537. More infrastructure:
- Put a bin/nuance in place with bin/nuance import. This has no useful behavior yet.
- Allow sources to be searched by substring. This supports bin/nuance import --source whatever so you don't have to dig up PHIDs.
- Applied migrations.
- Ran bin/nuance import --source ... (no meaningful effect, but works fine).
- Searched for sources by substring in the UI.
Reviewed By: chad
Maniphest Tasks: T10537
Differential Revision: https://secure.phabricator.com/D15436