Feature/failover (#924)

* feature stream failover

backend/processing/src/processor/mod.rs

@@ -3,9 +3,11 @@ mod stalker;
 mod stalker_refresh;
 mod xtream;
 // mod affix;
+pub(in crate::processor) mod channel_group;
 mod deduplicate;
 mod epg;
 mod library;
+pub(in crate::processor) mod match_key;
 mod probe_handle_guard;
 mod providers;
 mod resolve_options;