chore(e2e): enable RN 0.81+ iOS prebuilt pods in example setup (#135)

## Summary

Updated the example app setup flow so React Native `0.81.x` to `0.83.x`
examples use React Native iOS prebuilt artifacts during `pod install`.

With this change:
- The existing `setup:pods` npm script now runs different iOS pod
install commands depending on the React Native version.
- The checked-in RN `0.81.6`, `0.82.1`, and `0.83.2` example apps were
refreshed to match the same rule.

## Changes

- Updated `setup-example-app` so the generated `setup:pods` script is
version-aware
- RN `0.81.x` to `0.83.x`
  - `RCT_USE_RN_DEP=1 RCT_USE_PREBUILT_RNCORE=1 bundle exec pod install`
- RN `< 0.81.0`
  - keeps the existing `bundle exec pod install`
- RN `>= 0.84.0`
  - keeps the default React Native behavior

## Expected Impact

- Reduces iOS dependency installation time for RN `0.81+` example apps

Author: floydkim

Examples/RN0816/ios/Podfile.lock

@@ -385,6 +385,7 @@
 				REACT_NATIVE_PATH = "${PODS_ROOT}/../../node_modules/react-native";
 				SDKROOT = iphoneos;
 				SWIFT_ACTIVE_COMPILATION_CONDITIONS = "$(inherited) DEBUG";
+				SWIFT_ENABLE_EXPLICIT_MODULES = NO;
 				SWIFT_OBJC_BRIDGING_HEADER = "RN0816/RN0816-Bridging-Header.h";
 				USE_HERMES = true;
 			};
@@ -455,6 +456,7 @@
 				);
 				REACT_NATIVE_PATH = "${PODS_ROOT}/../../node_modules/react-native";
 				SDKROOT = iphoneos;
+				SWIFT_ENABLE_EXPLICIT_MODULES = NO;
 				SWIFT_OBJC_BRIDGING_HEADER = "RN0816/RN0816-Bridging-Header.h";
 				USE_HERMES = true;
 				VALIDATE_PRODUCT = YES;

Examples/RN0816/ios/RN0816.xcodeproj/project.pbxproj

@@ -9,7 +9,7 @@
     "start": "react-native start",
     "test": "jest",
     "sync-local-library": "ts-node --project tsconfig.json \"../../scripts/setupExampleApp/syncLocalLibrary.ts\"",
-    "setup:pods": "bundle install && cd ios && bundle exec pod install",
+    "setup:pods": "bundle install && cd ios && RCT_USE_RN_DEP=1 RCT_USE_PREBUILT_RNCORE=1 bundle exec pod install",
     "postinstall": "npm run sync-local-library"
   },
   "dependencies": {