[WIP] Add mined owner chunks for efficient notifications

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Summary

This PR introduces SWIP-42: Mined Owner Chunks (MOCs) - a new specification for efficient notifications in the Swarm network.

What are Mined Owner Chunks?

Mined Owner Chunks (MOCs) are Single Owner Chunks (SOC) where either the ID or owner is fixed and the other part is mined so that the SOC address falls into a particular target neighborhood. This enables robust notifications without the drawbacks of existing communication methods.

Key Improvements

MOCs address major deficiencies in current Swarm notification mechanisms:

• vs. Outbox feeds: No constant polling required - more efficient in both processing and bandwidth
• vs. PSS (trojan chunks): No real-time mining per message needed - eliminates CPU inefficiency and sending delays
• vs. gSOCs: Better privacy, no identity leakage, retrievable outside the neighborhood, and resistant to undermining attacks

Main Features

1. Preminable addresses: Eliminates sending delay as addresses can be pre-mined
2. Content neutral: Same address can be associated with arbitrary content
3. Async deliverability: Messages automatically synchronize with pull-sync
4. Privacy preserving: Recipients can be located anywhere in the network
5. Historical syncing: Past messages retrievable via historical pull-sync

Implementation

• Adds comprehensive specification document as SWIPs/swip-MOC.md
• Includes API design for sender and receiver endpoints
• Details implementation notes for bee and js tooling
• Covers identity management considerations

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