WIP: Spec Compliant Retrieval Deals

[hannahhoward]

Goals

Implement retrieval deal spec v0

Builds on #25
fix filecoin-project/go-retrieval-market-project#7

Implementation

• so far:

  • setup architecture for state transitions in retrieval deal
  • define state handlers
  • define abstraction for state handlers testing
  • implement and test two of the handlers
  • tests for third + psuedocode implementation

• to do:

  • tests for final handler
  • remaining handler for client
  • provider side
  • integration tests