migrations/codeintel: add API docs search indexing DB schema
Created by: slimsag
This migration adds two new tables to the codeintel DB:
lsif_data_documentation_search_public
lsif_data_documentation_search_private
Combined, these tables will contain all of the necessary data to perform fuzzy search over API docs data at a symbol level, globally across public and private repositories.
For details on why we're using Postgres FTS, estimates on how well this will scale, limitations, etc. see the architecture docs added in #25197
Helps #25193
Signed-off-by: Stephen Gutekanst [email protected]