feat(turbo-tasks-fs): enable fs watcher on wasm

[xusd320]

RT.

[gemini-code-assist]

Summary of Changes

Hello @xusd320, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request significantly enhances the turbo-tasks-fs crate by introducing robust file system watching capabilities for WebAssembly environments. This enables applications running in browser-like contexts to efficiently monitor and react to changes in the file system, which is crucial for dynamic content and development workflows.

Highlights

• WASM File System Watcher Enabled: The core functionality of file system watching has been extended and enabled for WebAssembly (WASM) targets within the turbo-tasks-fs crate, allowing real-time file system event monitoring in WASM environments.
• Dependency Updates and Refactoring: Key dependencies such as tokio-fs-ext were updated to version 0.6.0 with new features (opfs_offload, opfs_watch), and notify-types was introduced to provide a unified event handling mechanism across different platforms.
• Platform-Specific Implementations: The watcher module is now universally available, with distinct implementations for native and WASM environments. The WASM implementation leverages wasm_fs_offload::CLIENT.watch_dir to process file system events and invalidate caches.
• Asynchronous Operations for WASM: File system operations and watcher initialization for WASM targets are now asynchronous, aligning with the nature of browser-based file system interactions.

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[gemini-code-assist]

Code Review

This pull request enables the filesystem watcher on wasm targets. The changes involve updating dependencies and using conditional compilation to provide a wasm-specific watcher implementation. I've found a few critical issues that will prevent the feature from working correctly or break existing functionality on other platforms. There are also some medium-severity issues related to code clarity and maintainability.