Prefetching (non-slop)

[markovejnovic]

No description provided.

[mesa-dot-dev]

Mesa Description

This PR introduces a new asynchronous, multi-layered filesystem caching layer designed to improve performance by prefetching and caching filesystem metadata and data.

The core of this change is AsyncFs, a new asynchronous filesystem cache that manages concurrent access to inodes and file data. It is supported by several new components:

• DCache: A directory entry cache to speed up lookups and readdir operations.
• FutureBackedCache: A generic cache to deduplicate concurrent asynchronous operations, ensuring that data is fetched only once.
• DropWard: A resource management system that handles automatic cleanup and eviction of cached resources, which is critical for managing the lifecycle of cached objects.

Together, these components create a robust and performant caching abstraction over the filesystem, laying the groundwork for significant I/O performance improvements.

^{Description generated by Mesa. Update settings}

[mesa-dot-dev]

Performed full review of e2d3738...b4fa0dc

Analysis

1. Incomplete architecture for new asynchronous filesystem caching - the AsyncFs component lacks critical interfaces for table population and write-through to the directory cache, making these data structures currently unusable.

2. Background task orchestration framework is added but not connected to the rest of the system, leaving the foundational infrastructure without clear integration paths.

3. Significant regression in telemetry configuration - removal of Trc::with_telemetry and hard-coding of OTLP exporter means application-level telemetry settings are now ignored.

4. The PR attempts to introduce multiple significant architectural changes simultaneously (async filesystem caching, background tasks, telemetry rework) without complete implementation paths for each.

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