Searching users requires wildcards #1771

Unlike posts, which does wildcard search by default, /wp/v2/users requires an exact match on any of the searched fields, because this is the internal behaviour of WP_User_Query. One cal work around this by doing /wp/v2/users?search=*ada* to match "adam" etc.

I propose we auto add the wildcards on to the search query in users to match that of /wp/v2/posts