MES-699: Commonize dcache

[markovejnovic]

No description provided.

[markovejnovic]

/review

[markovejnovic]

/review

[mesa-dot-dev]

Mesa Description

This pull request introduces a generic inode cache (ICache) to unify inode and file handle management across the LocalFs and Mescloud filesystem implementations.

Previously, both filesystems had separate, duplicated logic for managing inode lifecycles, reference counting, and attribute caching. This refactoring centralizes that logic into a new, reusable icache module (src/fs/icache).

Key changes include:

• New Generic ICache: A new src/fs/icache module was added, providing a generic cache for inode control blocks (ICBs) with built-in reference counting and file handle allocation.
• LocalFs Refactor: The local filesystem's custom inode_table was replaced with the new generic ICache, simplifying its implementation.
• Mescloud Refactor: A new MescloudICache was created as a specialized wrapper around the generic ICache. All mescloud filesystem components (MesaFS, OrgFs, RepoFs) were updated to delegate their inode management responsibilities to this new, centralized cache.

This change significantly reduces code duplication, improves consistency, and simplifies maintenance for all filesystem implementations.

^{Description generated by Mesa. Update settings}

[mesa-dot-dev]

Performed full review of 5953938...c1015dd

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