query events by handle (not just DID)

[bnewbold]

In the ozone events view, there is a field to filter by the creator of the event, by DID. Would be nice to use a handle as well. We could change the lexicons to support at-identifier (and have the server/backend do any necessary handle resolution), or have the client do handle resolution.

A bonus feature would be typeahead search on that field, similar to how the search box on bsky.app works.

Another bonus feature would be adding this kind of typeahead search and handle-or-DID resolution in any other DID-entry fields in the app (don't have any others in mind, but there are probably a few?).