Introduce frozen indices. (#6307)

* Introduce frozen indices.

* Fix.

* Bump runtime

* Benchmark for freeze

* Fix

* fix benchmarks

* update freeze weights

* remove copy pasta

Co-authored-by: Shawn Tabrizi <shawntabrizi@gmail.com>

substrate/bin/node/runtime/src/lib.rs

@@ -95,8 +95,8 @@ pub const VERSION: RuntimeVersion = RuntimeVersion {
 	// and set impl_version to 0. If only runtime
 	// implementation changes and behavior does not, then leave spec_version as
 	// is and increment impl_version.
-	spec_version: 251,
-	impl_version: 2,
+	spec_version: 252,
+	impl_version: 0,
 	apis: RUNTIME_API_VERSIONS,
 	transaction_version: 1,
 };