primitives: Move out of staging released APIs (#3925)

Runtime release 1.2 includes bumping of the ParachainHost APIs up to
v10, so let's move all the released APIs out of vstaging folder, this PR
does not include any logic changes only renaming of the modules and some
moving around.

Signed-off-by: Alexandru Gheorghe <alexandru.gheorghe@parity.io>

polkadot/primitives/src/runtime_api.rs

@@ -114,13 +114,11 @@
 //! separated from the stable primitives.
 
 use crate::{
-	async_backing, slashing,
-	vstaging::{self, ApprovalVotingParams},
-	AsyncBackingParams, BlockNumber, CandidateCommitments, CandidateEvent, CandidateHash,
-	CommittedCandidateReceipt, CoreIndex, CoreState, DisputeState, ExecutorParams,
-	GroupRotationInfo, Hash, OccupiedCoreAssumption, PersistedValidationData, PvfCheckStatement,
-	ScrapedOnChainVotes, SessionIndex, SessionInfo, ValidatorId, ValidatorIndex,
-	ValidatorSignature,
+	async_backing, slashing, ApprovalVotingParams, AsyncBackingParams, BlockNumber,
+	CandidateCommitments, CandidateEvent, CandidateHash, CommittedCandidateReceipt, CoreIndex,
+	CoreState, DisputeState, ExecutorParams, GroupRotationInfo, Hash, NodeFeatures,
+	OccupiedCoreAssumption, PersistedValidationData, PvfCheckStatement, ScrapedOnChainVotes,
+	SessionIndex, SessionInfo, ValidatorId, ValidatorIndex, ValidatorSignature,
 };
 
 use polkadot_core_primitives as pcp;
@@ -279,7 +277,7 @@ sp_api::decl_runtime_apis! {
 		/// Get node features.
 		/// This is a staging method! Do not use on production runtimes!
 		#[api_version(9)]
-		fn node_features() -> vstaging::NodeFeatures;
+		fn node_features() -> NodeFeatures;
 
 		/***** Added in v10 *****/
 		/// Approval voting configuration parameters