feat: complete New Architecture (Turbo Modules) support for Android & IOS, closes #85

[J4cKr0y]

Feat(android, ios): migrate to New Architecture (TurboModules) with backward compatibility

Migrate @react-native-ml-kit/text-recognition to the React Native New Architecture (JSI/TurboModules) while preserving full support for the old Bridge-based architecture.

Android:

• TextRecognitionModule now extends NativeTextRecognitionSpec (Codegen) instead of ReactContextBaseJavaModule business logic unchanged
• TextRecognitionPackage split into two sourcesets: src/newarch/ ? extends TurboReactPackage (New Arch) src/oldarch/ ? implements ReactPackage (Old Arch)
• build.gradle updated with isNewArchitectureEnabled() guard and Codegen configuration

iOS:

• Add RNTextRecognition.h/.mm implementing the MLKit text recognition logic in Objective-C++
• getTurboModule() wired behind #ifdef RCT_NEW_ARCH_ENABLED no impact on old arch builds
• text-recognition.podspec updated with conditional New Arch dependencies (React-Codegen, RCT-Folly, ReactCommon/turbomodule/core)

JS:

• Add NativeTextRecognition.ts as the Codegen spec (source of truth)
• Add src/index.ts with dual-arch routing via global.__turboModuleProxy

Tests:

• TextRecognitionModuleTest.java (JUnit 4 + Mockito + Robolectric)
• RNTextRecognitionTests.swift (XCTest)
• textRecognition.test.ts (Jest) covering result structure, script parameter, error propagation, and dual-arch routing

Tooling:

• Replace deprecated babel-preset-react-native with metro-react-native-babel-preset
• Add babel.config.js, tsconfig.json, jest.setup.js
• Add TESTING.md with setup instructions for all three platforms

BREAKING CHANGE: none. Old arch users are unafected.