Include missing known keys (#6084)

* add defaultChildStorageKeyPrefix

* Adds known storage keys mentioned in #5746

* lint

Author: valentinfernandez1

packages/types/src/metadata/decorate/storage/substrate.ts

@@ -29,6 +29,10 @@ export const substrate: Record<string, Creator> = {
     docs: 'Wasm code of the runtime.',
     type: 'Bytes'
   }),
+  defaultChildStorageKeyPrefix: createSubstrateFn('defaultChildStorageKeyPrefix', ':child_storage:default:', {
+    docs: 'Prefix of the default child storage keys in the top trie.',
+    type: 'u32'
+  }),
   extrinsicIndex: createSubstrateFn('extrinsicIndex', ':extrinsic_index', {
     docs: 'Current extrinsic index (u32) is stored under this key.',
     type: 'u32'
@@ -40,5 +44,13 @@ export const substrate: Record<string, Creator> = {
   intrablockEntropy: createSubstrateFn('intrablockEntropy', ':intrablock_entropy', {
     docs: 'Current intra-block entropy (a universally unique `[u8; 32]` value) is stored here.',
     type: '[u8; 32]'
+  }),
+  storageVersionStorageKeyPostfix: createSubstrateFn('storageVersionStorageKeyPostfix', ':__STORAGE_VERSION__:', {
+    docs: 'The storage key postfix that is used to store the [`StorageVersion`] per pallet.',
+    type: 'u16'
+  }),
+  transactionLevelKey: createSubstrateFn('transactionLevelKey', ':transaction_level:', {
+    docs: 'The key that holds the current number of active layers.',
+    type: 'u32'
   })
 };