Migrate polkadot-primitives to v6 (#1543)

- Async-backing related primitives are stable `primitives::v6`
- Async-backing API is now part of `api_version(7)`
- It's enabled on Rococo and Westend runtimes

---------

Signed-off-by: Andrei Sandu <andrei-mihail@parity.io>
Co-authored-by: Andrei Sandu <54316454+sandreim@users.noreply.github.com>

polkadot/primitives/src/lib.rs

@@ -19,8 +19,8 @@
 #![warn(missing_docs)]
 #![cfg_attr(not(feature = "std"), no_std)]
 
-// `v5` is currently the latest stable version of the runtime API.
-pub mod v5;
+// `v6` is currently the latest stable version of the runtime API.
+pub mod v6;
 
 // The 'staging' version is special - it contains primitives which are
 // still in development. Once they are considered stable, they will be
@@ -33,20 +33,21 @@ pub mod runtime_api;
 
 // Current primitives not requiring versioning are exported here.
 // Primitives requiring versioning must not be exported and must be referred by an exact version.
-pub use v5::{
-	byzantine_threshold, check_candidate_backing, collator_signature_payload,
+pub use v6::{
+	async_backing, byzantine_threshold, check_candidate_backing, collator_signature_payload,
 	effective_minimum_backing_votes, metric_definitions, slashing, supermajority_threshold,
 	well_known_keys, AbridgedHostConfiguration, AbridgedHrmpChannel, AccountId, AccountIndex,
-	AccountPublic, ApprovalVote, AssignmentId, AuthorityDiscoveryId, AvailabilityBitfield,
-	BackedCandidate, Balance, BlakeTwo256, Block, BlockId, BlockNumber, CandidateCommitments,
-	CandidateDescriptor, CandidateEvent, CandidateHash, CandidateIndex, CandidateReceipt,
-	CheckedDisputeStatementSet, CheckedMultiDisputeStatementSet, CollatorId, CollatorSignature,
-	CommittedCandidateReceipt, CompactStatement, ConsensusLog, CoreIndex, CoreState, DisputeState,
-	DisputeStatement, DisputeStatementSet, DownwardMessage, EncodeAs, ExecutorParam,
-	ExecutorParams, ExecutorParamsHash, ExplicitDisputeStatement, GroupIndex, GroupRotationInfo,
-	Hash, HashT, HeadData, Header, HrmpChannelId, Id, InboundDownwardMessage, InboundHrmpMessage,
-	IndexedVec, InherentData, InvalidDisputeStatementKind, Moment, MultiDisputeStatementSet, Nonce,
-	OccupiedCore, OccupiedCoreAssumption, OutboundHrmpMessage, ParathreadClaim, ParathreadEntry,
+	AccountPublic, ApprovalVote, AssignmentId, AsyncBackingParams, AuthorityDiscoveryId,
+	AvailabilityBitfield, BackedCandidate, Balance, BlakeTwo256, Block, BlockId, BlockNumber,
+	CandidateCommitments, CandidateDescriptor, CandidateEvent, CandidateHash, CandidateIndex,
+	CandidateReceipt, CheckedDisputeStatementSet, CheckedMultiDisputeStatementSet, CollatorId,
+	CollatorSignature, CommittedCandidateReceipt, CompactStatement, ConsensusLog, CoreIndex,
+	CoreState, DisputeState, DisputeStatement, DisputeStatementSet, DownwardMessage, EncodeAs,
+	ExecutorParam, ExecutorParams, ExecutorParamsHash, ExplicitDisputeStatement, GroupIndex,
+	GroupRotationInfo, Hash, HashT, HeadData, Header, HorizontalMessages, HrmpChannelId, Id,
+	InboundDownwardMessage, InboundHrmpMessage, IndexedVec, InherentData,
+	InvalidDisputeStatementKind, Moment, MultiDisputeStatementSet, Nonce, OccupiedCore,
+	OccupiedCoreAssumption, OutboundHrmpMessage, ParathreadClaim, ParathreadEntry,
 	PersistedValidationData, PvfCheckStatement, PvfExecTimeoutKind, PvfPrepTimeoutKind,
 	RuntimeMetricLabel, RuntimeMetricLabelValue, RuntimeMetricLabelValues, RuntimeMetricLabels,
 	RuntimeMetricOp, RuntimeMetricUpdate, ScheduledCore, ScrapedOnChainVotes, SessionIndex,
@@ -61,4 +62,4 @@ pub use v5::{
 };
 
 #[cfg(feature = "std")]
-pub use v5::{AssignmentPair, CollatorPair, ValidatorPair};
+pub use v6::{AssignmentPair, CollatorPair, ValidatorPair};