Add channel monitor recovery for trampoline forwards

Implement channel monitor recovery for trampoline forwards
iterating over all hop data and updating pending forwards.

Author: a-mpch

lightning/src/ln/channelmanager.rs

@@ -16565,7 +16565,20 @@ where
 									monitor.channel_id(),
 								);
 							},
-							HTLCSource::TrampolineForward { .. } => todo!(),
+							HTLCSource::TrampolineForward { previous_hop_data, .. } => {
+								for current_previous_hop_data in previous_hop_data {
+									channel_monitor_recovery_internal(
+										&mut forward_htlcs,
+										&mut pending_events_read,
+										&mut pending_intercepted_htlcs,
+										&mut decode_update_add_htlcs,
+										current_previous_hop_data,
+										&logger,
+										htlc.payment_hash,
+										monitor.channel_id(),
+									);
+								}
+							},
 							HTLCSource::OutboundRoute {
 								payment_id,
 								session_priv,