Add block number to activated leaves and associated fixes (#2718)

* add number to `ActivatedLeavesUpdate`

* update subsystem util and overseer

* use new ActivatedLeaf everywhere

* sort view

* sorted and limited view in network bridge

* use live block hash only if it's newer

* grumples

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

@@ -128,7 +128,7 @@ impl CollationGenerationSubsystem {
 					let metrics = self.metrics.clone();
 					if let Err(err) = handle_new_activations(
 						config.clone(),
-						activated.into_iter().map(|v| v.0),
+						activated.into_iter().map(|v| v.hash),
 						ctx,
 						metrics,
 						sender,