Implement Delegated Routing PUT

[hacdias]

Tracking issue to implement delegated routing PUTs in someguy. This requires:

• routing/http!: support for IPIP-378 (delegated content and peer providing) boxo#539
• Some way of persisting data in someguy, even if it's only in memory (Local storage for local caching purposes #25)

[lidel]

• IPIP-378 never happened: IPIP-378: Delegated Routing HTTP POST API specs#378 (comment)
• as im writing this, we only support IPNS PUT
• closing for now, future PUTs need to be filled as new issue