Forc 0.35, fuels-rs 0.37

[tkporter]

• Updates to forc 0.35 and fuels-rs 0.37
  • Some changes to imports & types
  • Upstream bytes added a keccak function themselves
• There are a couple warnings - all seem to be innocuous false positives (e.g. an unused variable that is actually used to set the initial storage, or forc complaining about a storage read after calling out to an external contract). Will revisit at some point