feat: React Native New Architecture Support

[zhukaihan]

Supports RN new architecture.
Updated Android example app.

1. Update RN to 0.74.x. Lowest to support new arch with interop layer auto enabled.
2. Adding codegen config for generating native code.
3. Adding Spec for native code interface.
4. Updating native code to conform to spec interface.

[Copilot]

Pull Request Overview

This PR adds support for React Native's New Architecture (Fabric and TurboModules) while maintaining backward compatibility with the legacy architecture. The implementation introduces TurboModule specs, platform-specific conditional compilation, and updates the Android example app to the latest React Native version.

• Implements TurboModule interface for React Native New Architecture support
• Updates iOS and Android platform code with conditional compilation for architecture detection
• Modernizes the example app to React Native 0.74.5 with new architecture support

Reviewed Changes

Copilot reviewed 37 out of 62 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
src/NativeExperimentReactNativeClient.ts	TurboModule interface specification for the new architecture
package.json	Updates dependencies and adds codegen configuration for new architecture
ios/ExperimentReactNativeClient.swift	Adds conditional imports and extension for new architecture
ios/ExperimentReactNativeClient.mm	Bridge module implementation with new architecture support
ios/ExperimentReactNativeClient.m	Removed legacy bridge module implementation
experiment-react-native-client.podspec	Updates iOS platform requirements and dependencies for new architecture
example/	Comprehensive update of Android example app to React Native 0.74.5 with new architecture support
android/	Refactors Android implementation with separate modules for old/new architecture

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[zhukaihan]

Shared Android native code implementation.

[zhukaihan]

New arch Android implementation. To conform to the generated spec interface. Redirect call to shared impl.

[zhukaihan]

Old arch Android implementation. Old interface. Redirect call to shared impl.

[zhukaihan]

Conform implementation to the new spec interface if new arch enabled (through env var). Renaming to use cpp as React needs libs in cpp.

[zhukaihan]

Conforms to new arch if enabled.

[zhukaihan]

Spec interface for JS on react native side. Also used to generate native code interfaces that native code would implement. File has to begin with Native*.ts to be picked up by codegen.

[zhukaihan]

Upgraded RN to 0.74, async storage to 2.0.0.
Added codegen config.

[zhukaihan]

Use spec and turbo module.