Data programs version of Filclient (forked)

[hannahhoward]

@dkkapur needs the following from filc:

• track retrieval failures to a central database
  • client address
  • piece CID
  • payload CID
  • timestamp of retrieval finished
  • storage provider ID
  • success/fail
    • if fail, reason
• this will be in a fork of filclient, no merge master - so as to not increase scope of filclient

[dkkapur]

We should just grab a debug level log overall. from filecoin-project/dealbot#422:

instrument the retrieval flow from filc to produce DEBUG logs for the full lifecycle of a retrieval attempt (from initial dial to CAR output to disc or failure outcome with failure reasons)

[corinne-antonia]

@dkkapur Did we ever get to this? I'll help track.