perf: prevent bolt from rewriting files as often

[ali00209]

These changes implement the following improvements:

1. File content caching: We store the content and last modified time of each file in the #fileCache Map.
2. Content change check: Before writing a file, we check if the content has actually changed to avoid unnecessary writes.
3. Debounced writes: Instead of writing files immediately, we add them to a #pendingWrites Map and use a debounce timer to batch write operations.
4. Batch writing: After the debounce timer expires, we write all pending files in a single batch operation.

These modifications should significantly reduce the frequency of file rewrites, improving performance and reducing unnecessary I/O operations.