Implement interface for fetching and pinning encrypted records from distributed storage

[veryCrunchy]

Develop a Rust module for fetching and pinning encrypted uptime/downtime records from distributed storage. The interface should:

• Fetch records by CID or other criteria.
• Allow pinning/unpinning of records to ensure local/peer retention.
• Handle peer-to-peer requests for data, serving records to requesting nodes.
• Support listing pinned records for retention management.
• Integrate authentication/authorization so only valid requests are served.

Implementation Suggestions:

• Expand DistributedStorage trait with fetch, pin, unpin, list_pinned methods.
• Use crates: ipfs-api, rust-libp2p, or rust-ipfs.
• Consider a caching layer (e.g., with tokio).
• Ensure encrypted data is only decrypted by owner node.
• Add tests for pinning, fetching, and peer serving flows.

[obiente]

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