Delivery Acceleration

[yrong]

Context

This allows users to pay additional fees to speed up transfers using the FiatShamir approach. The gas cost is benchmarked here.

[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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[yrong]

Since we don't run on-demand relayer and the parachain relayer is currently profitibility-driven, delivery latency has increased recently.

To reduce latency, this PR includes the cost of the two-phase consensus update submission in the Ethereum execution fee by default.

Given that the average gas price over the last six months has been around 0.5 Gwei, the cost is effectively very close to legacy V1 (1.5–2 DOT). If gas prices increase significantly, however, the fee will be much higher.