feat: add support for blockTime on confirmed block (#15968)

web3.js/src/connection.ts

@@ -602,6 +602,7 @@ export type ParsedConfirmedTransaction = {
  * @property {number} parentSlot Slot index of this block's parent
  * @property {Array<object>} transactions Vector of transactions and status metas
  * @property {Array<object>} rewards Vector of block rewards
+ * @property {number|null} blockTime The unix timestamp of when the block was processed
  */
 export type ConfirmedBlock = {
   blockhash: Blockhash;
@@ -617,6 +618,7 @@ export type ConfirmedBlock = {
     postBalance: number | null;
     rewardType: string | null;
   }>;
+  blockTime: number | null;
 };
 
 /**
@@ -1247,6 +1249,7 @@ export const GetConfirmedBlockRpcResult = jsonRpcResult(
           }),
         ),
       ),
+      blockTime: nullable(number()),
     }),
   ),
 );