Conditional `auto_accept_invites` for certain `rooms` and `room_type`

The `homeserver.yaml` declaration [`auto_accept_invites`](https://element-hq.github.io/synapse/latest/usage/configuration/config_documentation.html#auto_accept_invites) looks like it would benefit from adding declarations regarding rooms and room types (for example m.spaces). There is an instance where having it enabled but only for room invites (but not DMs) would be an appropriate balance. So could we please have this expanded to include these capabilities?

* rooms
* room type (eg m.spaces/etc)