Finish migration to v2 primitives (#5037)

* remove v0 primitives from polkadot-primitives

* first pass: remove v0

* fix fallout in erasure-coding

* remove v1 primitives, consolidate to v2

* the great import update

* update runtime_api_impl_v1 to v2 as well

* guide: add `Version` request for runtime API

* add version query to runtime API

* reintroduce OldV1SessionInfo in a limited way

polkadot/node/malus/src/variants/back_garbage_candidate.rs

@@ -40,7 +40,7 @@ use polkadot_node_subsystem_util as util;
 use crate::{interceptor::*, shared::*};
 use polkadot_node_primitives::{PoV, ValidationResult};
 
-use polkadot_primitives::v1::{
+use polkadot_primitives::v2::{
 	CandidateCommitments, CandidateDescriptor, CandidateReceipt, PersistedValidationData,
 	ValidationCode,
 };

polkadot/node/malus/src/variants/suggest_garbage_candidate.rs

@@ -42,7 +42,7 @@ use polkadot_node_subsystem::{
 use polkadot_node_subsystem_util as util;
 // Filter wrapping related types.
 use crate::interceptor::*;
-use polkadot_primitives::v1::{
+use polkadot_primitives::v2::{
 	CandidateCommitments, CandidateReceipt, CommittedCandidateReceipt, CompactStatement, Hash,
 	Signed,
 };