"Edit tags" item in mulit-select context menu

[nathanielrindlaub]

High priority and light-ish lift. Will make the bulk-application of Tags infinitely more efficient.

[nathanielrindlaub]

Note for animl-api implementation: CRUD ops on tags can almost certainly be consolidated into single calls to the DB either via bulkWrite() or updateMany(), so I expect these to be pretty performant on large numbers of images (also it's hard to multi-select a really large number of images), but we should still test and build in safeguards/limits to prevent timeouts.

If we end up wanting to support CRUD ops on tags that take longer than the 30-second animl-api timeout, we may need to kick big batches to the async task handler (see tnc-ca-geo/animl-api#148).