Search Users v1 - Keyword Search

Purpose: Implement very basic user searching to figure out all the necessary features in stripes-connect to react to a user input, update the manifest and execute a new request againts the backend service (mod-users in this case)

As a user I want to be able to filter the list of user records shown in the middle pane by providing a single-keyword query in the search box in the left-most pane.

The query should be executed by sending an appropriate request via Okapi to the mod-users backend module.

The query should be resent to the server on every keystroke (typeahead) and the matching list of user records should be updated immediately (no explicit submit button)