Mesa Description

This pull request refactors the FUSE filesystem implementation to be fully thread-safe, enabling concurrent processing of filesystem operations. Previously, the single-threaded design caused the filesystem to block on long-running I/O operations, leading to unresponsiveness.

To achieve this, the following key changes were made:

• Asynchronous FUSE Adapter: The core FuserAdapter now spawns each filesystem operation (e.g., lookup, read) into a separate Tokio task, allowing the main FUSE loop to remain non-blocking.
• Thread-Safe Data Structures: Standard collections like HashMap were replaced with concurrent equivalents (scc::HashMap) or protected with parking_lot::RwLock across the entire mescloud module. This ensures that shared state can be safely accessed and modified by multiple threads.
• Immutable Trait Methods: The Fs trait was updated to use immutable &self receivers for most methods. This API change enables shared, parallel access to filesystem components, which is fundamental to the new concurrent design.
• Dependency Addition: The parking_lot crate was added to provide more efficient and feature-rich locking primitives compared to the standard library's Mutex.

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