Full-text search filter

[alex-dixon]

We've discussed adding this to search for facts in the diff view within a single state.

I think we should consider supporting searching across all states. If it's relatively feasible, it can be a good stand-in for full query support, which we might not be able to deliver quickly. Further, UIs can have a lot of events/actions (keypresses, etc), so having a way to filter through them would be great.

We're already indexing by e a v t of all facts from the inspected session, and we have the whole facts in map format as well, so it should be possible to have a faceted search by tuple slot as well as a "full text" one.