Merge pull request #2212 from ethereum-optimism/sc/sdk-wait-for-txs

fix(sdk): have sdk properly wait for transactions

.changeset/lemon-chefs-walk.md

+---
+'@eth-optimism/sdk': patch
+---
+
+Have SDK wait for transactions in getMessagesByTransaction

packages/sdk/src/cross-chain-messenger.ts

@@ -143,6 +143,13 @@ export class CrossChainMessenger implements ICrossChainMessenger {
       direction?: MessageDirection
     } = {}
   ): Promise<CrossChainMessage[]> {
+    // Wait for the transaction receipt if the input is waitable.
+    // TODO: Maybe worth doing this with more explicit typing but whatever for now.
+    if (typeof (transaction as any).wait === 'function') {
+      await (transaction as any).wait()
+    }
+
+    // Convert the input to a transaction hash.
     const txHash = toTransactionHash(transaction)
 
     let receipt: TransactionReceipt