fix(anvil): eth_gasPrice returned 1000000000 with --block-base-fee-per-gas 0, adds new --disable-min-priority-fee to return 0

[zerosnacks]

Motivation

Closes: #9033

Solution

Prefers a simple boolean flag to disable the enforcement rather than allowing the user to pass a priority fee of 0

Adds a new flag to disable min suggested priority fee: --disable-min-priority-fee

anvil --gas-price 0 --block-base-fee-per-gas 0 --disable-min-priority-fee

cast gas-price

Now yields 0 when the --disable-min-priority-fee is set

Without it still yields the MIN_SUGGESTED_PRIORITY_FEE:

foundry/crates/anvil/src/eth/fees.rs

Line 36 in eb04665

pub const MIN_SUGGESTED_PRIORITY_FEE: u128 = 1e9 as u128;