feat(market): enable deal state retrieval

[cernicc]

Description

Add deal retrieval to the storagext lib and cli.

Published deal output:

Deal Proposal { piece_cid: baga6ea4seaqbfhdvmk5qygevit25ztjwl7voyikb5k2fqcl2lsuefhaqtukuiii, piece_size: 2048, provider: 5FLSigC9HGRKVhB9FiEo4Y3koPsNmBmLJbpXg2mp1hXcS59Y, client: 5GrwvaEF5zXb26Fz9rcQpDWS57CtERHpNehXCPcNoHGKutQY, label: , start_block: 200, end_block: 250, storage_price_per_block: 500, provider_collateral: 1250, state: Published }

Activated deal output:

Deal Proposal { piece_cid: baga6ea4seaqbfhdvmk5qygevit25ztjwl7voyikb5k2fqcl2lsuefhaqtukuiii, piece_size: 2048, provider: 5FLSigC9HGRKVhB9FiEo4Y3koPsNmBmLJbpXg2mp1hXcS59Y, client: 5GrwvaEF5zXb26Fz9rcQpDWS57CtERHpNehXCPcNoHGKutQY, label: , start_block: 200, end_block: 250, storage_price_per_block: 500, provider_collateral: 1250, state: Active({ sector_number: 1, sector_start_block: 37, last_updated_block: None, slash_block: None }) }

[aidan46]

The implementation LGTM. Could you update the storagext CLI documentation to reflect this change?