add capabilities to response

EIPS/eip-5792.md

@@ -77,7 +77,10 @@ type SendCallsParams = {
   capabilities?: Record<string, any> | undefined;
 };
 
-type SendCallsResult = string;
+type SendCallsResult = {
+  id: string;
+  capabilities?: Record<string, any> | undefined;
+};
 ```
 
 ##### `wallet_sendCalls` Example Parameters
@@ -115,11 +118,14 @@ Note that since the `paymasterService` `capability` is marked as optional, walle
 ##### `wallet_sendCalls` Example Return Value
 
 The identifier MUST be unique 64 bytes represented as a hex encoded string.
-For a given session, users should be able to call `wallet_getCallsStatus` with this value and expect a call-batch status
-to be returned.
+For a given session, users should be able to call `wallet_getCallsStatus` with this value and expect a call-batch status to be returned.
+
+The `capabilities` object allows the wallets to attach a capability-specific metadata to the response.
 
 ```json
-"0x00000000000000000000000000000000000000000000000000000000000000000e670ec64341771606e55d6b4ca35a1a6b75ee3d5145a99d05921026d1527331"
+{
+  "id": "0x00000000000000000000000000000000000000000000000000000000000000000e670ec64341771606e55d6b4ca35a1a6b75ee3d5145a99d05921026d1527331",
+}
 ```
 
 ### `wallet_getCallsStatus`