feat: allow overriding the "most recent event" when forcing a state download (#853)

Add option to select which event to set the state at to, for the force-set-room-state admin command.

This allows us to work around issues where the latest PDU is one that remote servers don't know about (i.e. failed federation for whatever reason)

Closes #852

Reviewed-on: https://forgejo.ellis.link/continuwuation/continuwuity/pulls/853
Reviewed-by: Jade Ellis <jade@ellis.link>
Co-authored-by: nex <nex@noreply.forgejo.ellis.link>
Co-committed-by: nex <nex@noreply.forgejo.ellis.link>

src/admin/debug/mod.rs

@@ -177,6 +177,9 @@ pub(super) enum DebugCommand {
 		room_id: OwnedRoomId,
 		/// The server we will use to query the room state for
 		server_name: OwnedServerName,
+		/// The event ID of the latest known PDU in the room. Will be found
+		/// automatically if not provided.
+		event_id: Option<OwnedEventId>,
 	},
 
 	/// - Runs a server name through conduwuit's true destination resolution