Submit Fiat-Shamir (FE)

[yrong]

Context

This allows users to pay additional fees to speed up transfers using the FiatShamir approach. More context in PR-1462

The gas cost is benchmarked here.

Further changes are required on the relay side to pick up transfers/orders using the FiatShamir approach.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 80.10%. Comparing base (ee36155) to head (3e62355).

Additional details and impacted files

@@                  Coverage Diff                  @@
##           ron/submitFiatShamir    #1562   +/-   ##
=====================================================
  Coverage                 80.10%   80.10%           
=====================================================
  Files                        21       21           
  Lines                       930      930           
  Branches                    162      162           
=====================================================
  Hits                        745      745           
  Misses                      159      159           
  Partials                     26       26           

Flag	Coverage Δ
solidity	80.10% <ø> (ø)

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