Add dev_getBlockStats RPC (#4677)

* Add dev_getBlockStats RPC

* CHANGELOG

packages/types/src/interfaces/definitions.ts

@@ -14,6 +14,7 @@ export { default as collective } from './collective/definitions';
 export { default as consensus } from './consensus/definitions';
 export { default as contracts } from './contracts/definitions';
 export { default as democracy } from './democracy/definitions';
+export { default as dev } from './dev/definitions';
 export { default as elections } from './elections/definitions';
 export { default as engine } from './engine/definitions';
 export { default as evm } from './evm/definitions';

packages/types/src/interfaces/dev/definitions.ts

@@ -0,0 +1,31 @@
+// Copyright 2017-2022 @polkadot/types authors & contributors
+// SPDX-License-Identifier: Apache-2.0
+
+// order important in structs... :)
+/* eslint-disable sort-keys */
+
+import type { Definitions } from '../../types';
+
+export default {
+  rpc: {
+    getBlockStats: {
+      description: 'Reexecute the specified `block_hash` and gather statistics while doing so',
+      params: [
+        {
+          name: 'at',
+          type: 'Hash',
+          isHistoric: true
+        }
+      ],
+      type: 'Option<BlockStats>'
+    }
+  },
+  types: {
+    BlockStats: {
+      witnessLen: 'u64',
+      witnessCompactLen: 'u64',
+      blockLen: 'u64',
+      blockNumExtrinsics: 'u64'
+    }
+  }
+} as Definitions;