Partial Results Update - Start the fetch

**Summary:**
Use ajax to update the search results live while the user is interacting or finishing with adding lozenges.
[Spike ticket where research work on this issue was documented](https://github.com/hypothesis/h/issues/4219)

**Task to be completed:**
- [ ] create/delete lozenge and create an event to indicate a fetch request has been made
- [ ] listen to update results event and update the groups and tags lists
- [ ] listen to update results event to get the form action and update the form thats bound to the search bar

Start with the linked spike ticket #4219, then trace the lozenge actions and search-bar form flow. Confirm the event used for fetch requests, the update-results listener, and the groups, tags, and form updates; the work is done when creating or deleting a lozenge triggers the fetch and all three updates occur.

Written by the indexing model from the issue text.