Implement all storage after prefix (#4227)

* Implement all storage after prefix

* fix test, bump version and fix doc

* bump metadata version

* Update frame/support/procedural/src/storage/storage_struct.rs

substrate/frame/metadata/src/lib.rs

@@ -342,8 +342,10 @@ pub enum RuntimeMetadata {
 	V6(RuntimeMetadataDeprecated),
 	/// Version 7 for runtime metadata. No longer used.
 	V7(RuntimeMetadataDeprecated),
-	/// Version 8 for runtime metadata.
-	V8(RuntimeMetadataV8),
+	/// Version 8 for runtime metadata. No longer used.
+	V8(RuntimeMetadataDeprecated),
+	/// Version 9 for runtime metadata.
+	V9(RuntimeMetadataV9),
 }
 
 /// Enum that should fail.
@@ -367,12 +369,12 @@ impl Decode for RuntimeMetadataDeprecated {
 /// The metadata of a runtime.
 #[derive(Eq, Encode, PartialEq, RuntimeDebug)]
 #[cfg_attr(feature = "std", derive(Decode, Serialize))]
-pub struct RuntimeMetadataV8 {
+pub struct RuntimeMetadataV9 {
 	pub modules: DecodeDifferentArray<ModuleMetadata>,
 }
 
 /// The latest version of the metadata.
-pub type RuntimeMetadataLastVersion = RuntimeMetadataV8;
+pub type RuntimeMetadataLastVersion = RuntimeMetadataV9;
 
 /// All metadata about an runtime module.
 #[derive(Clone, PartialEq, Eq, Encode, RuntimeDebug)]
@@ -397,6 +399,6 @@ impl Into<primitives::OpaqueMetadata> for RuntimeMetadataPrefixed {
 
 impl Into<RuntimeMetadataPrefixed> for RuntimeMetadataLastVersion {
 	fn into(self) -> RuntimeMetadataPrefixed {
-		RuntimeMetadataPrefixed(META_RESERVED, RuntimeMetadata::V8(self))
+		RuntimeMetadataPrefixed(META_RESERVED, RuntimeMetadata::V9(self))
 	}
 }