refactor View to include finalized_number (#2128)

* refactor View to include finalized_number

* guide: update the NetworkBridge on BlockFinalized

* av-store: fix the tests

* actually fix tests

* grumbles

* ignore macro doctest

* use Hash::repeat_bytes more consistently

* broadcast empty leaves updates as well

* fix issuing view updates on empty leaves updates

polkadot/node/collation-generation/src/lib.rs

@@ -145,7 +145,7 @@ impl CollationGenerationSubsystem {
 				}
 				false
 			}
-			Ok(Signal(BlockFinalized(_))) => false,
+			Ok(Signal(BlockFinalized(..))) => false,
 			Err(err) => {
 				tracing::error!(
 					target: LOG_TARGET,