Search/Filter for People and Groups

Update July 23:
- [x] Search on `/admin/people`.
- [ ] Filter on Groups page
- [ ] Filter for a group on `/admin/people`

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Hey there!

Is it possible to add a search box or filter to the "People" and "Group" page located under the Admin Panel?
With a lot of users it gets difficult to find the user without scrolling forever. I know i can use CTRL+F to search, but it would be nice to have search box in metabase.

Another feature would be to be able to search for a group in "People" which returns all users in this group. I know i can do this in the "Groups" tab, but this will not show me the other groups which the user is part of.

:arrow_down: Please click the :+1: reaction instead of leaving a `+1` or `update?` comment

Start with the Admin Panel’s `/admin/people` and Groups pages, using the completed People search as context for the remaining work. Confirm the desired behavior for filtering the Groups page and filtering People by group, including showing a user’s other groups. Done means both unchecked checklist items work without requiring manual scrolling.

Written by the indexing model from the issue text.