Add support for text note search

[ndobb]

@ritche-long TODOs

• [x] Display metadata about note (dates, patient IDs, etc)
• [x] Search hints (radix tree https://en.wikipedia.org/wiki/Radix_tree)
• [x] Tokenization tightening (don't index hyphens, parens, etc.)
• [ ] Paginate (lower priority)
• [ ] ~~Allow synonyms~~
• [ ] Expand full note into modal upon click

@ndobb

• [ ] Figure out how to save searched notes, searched subcohorts, etc

@ritche-long and @ndobb

• [ ] General UI cleanup and tightening