Collation protocol: stricter validators (#2810)

* guide: declare one para as a collator

* add ParaId to Declare messages and clean up

* fix build

* fix the testerinos

* begin adding keystore to collator-protocol

* remove request_x_ctx

* add core_for_group

* add bump_rotation

* add some more helpers to subsystem-util

* change signing_key API to take ref

* determine current and next para assignments

* disconnect collators who are not on current or next para

* add collator peer count metric

* notes for later

* some fixes

* add data & keystore to test state

* add a test utility for answering runtime API requests

* fix existing collator tests

* add new tests

* remove sc_keystore

* update cargo lock

Co-authored-by: Andronik Ordian <write@reusable.software>

polkadot/node/network/protocol/src/lib.rs

@@ -335,11 +335,11 @@ pub mod v1 {
 		/// Declare the intent to advertise collations under a collator ID, attaching a
 		/// signature of the `PeerId` of the node using the given collator ID key.
 		#[codec(index = 0)]
-		Declare(CollatorId, CollatorSignature),
+		Declare(CollatorId, ParaId, CollatorSignature),
 		/// Advertise a collation to a validator. Can only be sent once the peer has
 		/// declared that they are a collator with given ID.
 		#[codec(index = 1)]
-		AdvertiseCollation(Hash, ParaId),
+		AdvertiseCollation(Hash),
 		/// A collation sent to a validator was seconded.
 		#[codec(index = 4)]
 		CollationSeconded(SignedFullStatement),