[SP Node] Market protocol — implement Data Transfer protocol

[cernicc]

This should be implemented as graphsync protocol, it will be used to sync graphs across peers. In our case, that means synchronizing Piece data between a specific storage provider and a client. This happens in the negotiation phase.

https://github.com/eigerco/polka-disk/blob/main/doc/research/lotus/lotus-overview.md#negotiation-phase
https://github.com/eigerco/polka-disk/blob/main/doc/research/lotus/lotus-overview.md#data-transfer-protocol

[cernicc]

There is no "official" implementation of graphsync protocol for libp2p rust.

• https://github.com/retrieval-markets-lab/rs-graphsync last commit was 2 years ago. It probably works but it is probably unmaintained,

[jmg-duarte]

Moved to P3 for now

[th7nder]

Talked with @cernicc , seems not relevant anymore.