Filter assigned to team or its members directly

### Problem Statement

I want to know how many issues are still assigned to a given team. In some teams the workflow is as such
- Nobody is working on it => assigned to team
- A team member is working on it => he reassigns the issue in sentry to himself (so another member doesn't attempt to fix something already being worked on)

Currently I can only find out the currently remaining issues by manually filtering the assignee by all the members of a team + the team itself.

### Solution Brainstorm

When filtering by a team, it should also filter by its members