Support events with mixed payloads in codegen (facebook#36942)

Summary:
Pull Request resolved: facebook#36942

Changelog:
[General][Changed] - Support mixed props for events in codegen

Reviewed By: javache

Differential Revision: D44580879

fbshipit-source-id: 52f3b12795af767c038e2db7a4faf46cf2906b95

packages/react-native-codegen/e2e/__tests__/components/__snapshots__/GenerateEventEmitterCpp-test.js.snap

@@ -14,6 +14,7 @@ Object {
 
 #include <react/renderer/components/RNCodegenModuleFixtures/EventEmitters.h>
 
+
 namespace facebook {
 namespace react {
 
@@ -37,6 +38,7 @@ Object {
 
 #include <react/renderer/components/RNCodegenModuleFixtures/EventEmitters.h>
 
+
 namespace facebook {
 namespace react {
 
@@ -60,6 +62,7 @@ Object {
 
 #include <react/renderer/components/RNCodegenModuleFixtures/EventEmitters.h>
 
+
 namespace facebook {
 namespace react {
 
@@ -83,6 +86,7 @@ Object {
 
 #include <react/renderer/components/RNCodegenModuleFixtures/EventEmitters.h>
 
+
 namespace facebook {
 namespace react {
 
@@ -106,6 +110,7 @@ Object {
 
 #include <react/renderer/components/RNCodegenModuleFixtures/EventEmitters.h>
 
+
 namespace facebook {
 namespace react {
 
@@ -129,6 +134,7 @@ Object {
 
 #include <react/renderer/components/RNCodegenModuleFixtures/EventEmitters.h>
 
+
 namespace facebook {
 namespace react {
 
@@ -152,6 +158,7 @@ Object {
 
 #include <react/renderer/components/RNCodegenModuleFixtures/EventEmitters.h>
 
+
 namespace facebook {
 namespace react {
 
@@ -161,12 +168,12 @@ void EventNestedObjectPropsNativeComponentViewEventEmitter::onChange(OnChange $e
     {
   auto location = jsi::Object(runtime);
   {
-  auto source = jsi::Object(runtime);
-  source.setProperty(runtime, \\"url\\", $event.location.source.url);
-  location.setProperty(runtime, \\"source\\", source);
-}
-location.setProperty(runtime, \\"x\\", $event.location.x);
-location.setProperty(runtime, \\"y\\", $event.location.y);
+    auto source = jsi::Object(runtime);
+    source.setProperty(runtime, \\"url\\", $event.location.source.url);
+    location.setProperty(runtime, \\"source\\", source);
+  }
+  location.setProperty(runtime, \\"x\\", $event.location.x);
+  location.setProperty(runtime, \\"y\\", $event.location.y);
   $payload.setProperty(runtime, \\"location\\", location);
 }
     return $payload;
@@ -193,6 +200,7 @@ Object {
 
 #include <react/renderer/components/RNCodegenModuleFixtures/EventEmitters.h>
 
+
 namespace facebook {
 namespace react {
 
@@ -272,6 +280,7 @@ Object {
 
 #include <react/renderer/components/RNCodegenModuleFixtures/EventEmitters.h>
 
+
 namespace facebook {
 namespace react {
 
@@ -295,6 +304,7 @@ Object {
 
 #include <react/renderer/components/RNCodegenModuleFixtures/EventEmitters.h>
 
+
 namespace facebook {
 namespace react {
 
@@ -318,6 +328,7 @@ Object {
 
 #include <react/renderer/components/RNCodegenModuleFixtures/EventEmitters.h>
 
+
 namespace facebook {
 namespace react {
 
@@ -341,6 +352,7 @@ Object {
 
 #include <react/renderer/components/RNCodegenModuleFixtures/EventEmitters.h>
 
+
 namespace facebook {
 namespace react {
 
@@ -372,6 +384,7 @@ Object {
 
 #include <react/renderer/components/RNCodegenModuleFixtures/EventEmitters.h>
 
+
 namespace facebook {
 namespace react {
 
@@ -395,6 +408,7 @@ Object {
 
 #include <react/renderer/components/RNCodegenModuleFixtures/EventEmitters.h>
 
+
 namespace facebook {
 namespace react {
 
@@ -418,6 +432,7 @@ Object {
 
 #include <react/renderer/components/RNCodegenModuleFixtures/EventEmitters.h>
 
+
 namespace facebook {
 namespace react {
 
@@ -441,6 +456,7 @@ Object {
 
 #include <react/renderer/components/RNCodegenModuleFixtures/EventEmitters.h>
 
+
 namespace facebook {
 namespace react {
 
@@ -464,6 +480,7 @@ Object {
 
 #include <react/renderer/components/RNCodegenModuleFixtures/EventEmitters.h>
 
+
 namespace facebook {
 namespace react {
 
@@ -487,6 +504,7 @@ Object {
 
 #include <react/renderer/components/RNCodegenModuleFixtures/EventEmitters.h>
 
+
 namespace facebook {
 namespace react {