Warp sync part II (#9284)

* Gap sync

* Gap epoch test

* Simplified network requests

* Update client/db/src/utils.rs

Co-authored-by: cheme <emericchevalier.pro@gmail.com>

* Fixed v1 migration and added some comments

* Next epoch is always regular

* Removed fork tree change

* Apply suggestions from code review

Co-authored-by: Bastian Köcher <bkchr@users.noreply.github.com>

* Added a comment and converted assert to error

Co-authored-by: cheme <emericchevalier.pro@gmail.com>
Co-authored-by: Bastian Köcher <bkchr@users.noreply.github.com>

substrate/bin/node/cli/src/service.rs

@@ -244,6 +244,7 @@ pub fn new_full_base(
 	let warp_sync = Arc::new(grandpa::warp_proof::NetworkProvider::new(
 		backend.clone(),
 		import_setup.1.shared_authority_set().clone(),
+		Vec::default(),
 	));
 
 	let (network, system_rpc_tx, network_starter) =
@@ -531,6 +532,7 @@ pub fn new_light_base(
 	let warp_sync = Arc::new(grandpa::warp_proof::NetworkProvider::new(
 		backend.clone(),
 		grandpa_link.shared_authority_set().clone(),
+		Vec::default(),
 	));
 
 	let (network, system_rpc_tx, network_starter) =