hackathon - search/notebook: basic notebooks query

[bobheadxi]

This is a hackathon project, and is not being merged into main! See https://sourcegraph.com/notebooks/Tm90ZWJvb2s6NTE5

Implements a basic end-to-end query that searches the full "notebook name" (namespace + title) with a simple ILIKE query. The query emulates how normal search works by replacing spaces with wildcards so you can be pretty loose with your query.

Sharing code with enterprise/.../notebooks: we could possibly refactor this so that it lives in the same store as other notebooks stuff, but register it as the handler for the notebook search job from an init function. That said it makes sense, perhaps, to have the DB queries live here so that we can specialize it for search. It would be nice to share the permissions filter at least, however - not sure where this would live.

Stacked on https://github.com/sourcegraph/sourcegraph/pull/33161

Kapture.2022-03-28.at.17.48.03.mp4

[sourcegraph-bot]

Codenotify: Notifying subscribers in CODENOTIFY files for diff 01e9514...ca26530.

Notify	File(s)
@beyang	internal/search/job/job.go internal/search/notebook/notebook.go internal/search/notebook/store.go internal/search/notebook/store_copied.go
@camdencheek	internal/search/job/job.go internal/search/notebook/notebook.go internal/search/notebook/store.go internal/search/notebook/store_copied.go
@keegancsmith	internal/search/job/job.go internal/search/notebook/notebook.go internal/search/notebook/store.go internal/search/notebook/store_copied.go

[tsenart]

This probably doesn't use any indexes because of the CONCAT. Not a biggie for hackday, but in production code it's important.