feat: prepare storage 0.5.1 release

[JoaoPauloCMarra]

Summary

Prepare react-native-nitro-storage 0.5.1 with storage events, raw export support, expanded coverage gates, Expo example smoke coverage, dependency alignment, and faster release tooling.

Changes

• Add storage event subscriptions, event observer support, raw storage.export(scope), and StorageItem#subscribeSelector().
• Expand native/web parity tests, JS/TS coverage gates, and C++ coverage reporting.
• Extend the example smoke runner and Maestro flow for platform-aware API validation.
• Align Expo example and workspace dependency pins with Expo Doctor.
• Refactor publish dry-runs with release-doc validation, timed checks, coverage option, and lifecycle verification mode.

Why

This release improves state/event integration, hardens release confidence, and reduces duplicated publish-script work while preserving exact npm lifecycle validation when needed.

Test

• bun run lint -- --filter=react-native-nitro-storage
• bun run format:check -- --filter=react-native-nitro-storage
• bun run typecheck -- --filter=react-native-nitro-storage
• bun run test:types -- --filter=react-native-nitro-storage
• bun run test -- --filter=react-native-nitro-storage
• bun run test:coverage -- --filter=react-native-nitro-storage
• bun run test:cpp -- --filter=react-native-nitro-storage
• bun run test:cpp:coverage -- --filter=react-native-nitro-storage
• bunx expo-doctor in apps/example
• bun run --cwd apps/example prebuild
• bun run --cwd apps/example android
• bun run --cwd apps/example ios -- --device "iPhone 17 Pro Max"
• maestro --device 5D238571-5E06-417E-8286-1F6DF979F5A7 test apps/example/.maestro/main.yaml
• bun run publish-package:dry -- --yes --allow-dirty --with-coverage
• bun run publish-package:dry -- --yes --allow-dirty --verify-npm-lifecycle --skip-pack-preview