Fixes#9282
Adds a new admin panel category for federation related administration.
Includes views for:
- Instance Federation Configuration
- List of Federation Hosts
- (Per-Instance) List of Federated Users
Reviewed-on: https://codeberg.org/forgejo/forgejo/pulls/11115
Reviewed-by: elle <0xllx0@noreply.codeberg.org>
Reviewed-by: Panagiotis "Ivory" Vasilopoulos <git@n0toose.net>
Reviewed-by: Gusted <gusted@noreply.codeberg.org>
Co-authored-by: Florian Pallas <mail@fpallas.com>
Co-committed-by: Florian Pallas <mail@fpallas.com>
