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 76.90%. Comparing base (1201293) to head (73f465f).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1562   +/-   ##
=======================================
  Coverage   76.90%   76.90%           
=======================================
  Files          24       24           
  Lines         983      983           
  Branches      186      186           
=======================================
  Hits          756      756           
  Misses        203      203           
  Partials       24       24           

Flag	Coverage Δ
solidity	76.90% <100.00%> (ø)

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