Adding the ability to fuzz max_priority_fee_per_gas

[op-will]

Note: forked from v0.10.0 which is why this conflicts with main

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Adding ability to fuzz max_priority_fee_per_gas

Example scenario config to fuzz max_priority_fee_per_gas:

# Scenario config here

# ...

[[spam]]
[spam.tx]

# ...

fuzz = [
    # 10–20 gwei priority-fee tip. Edit in place to widen/narrow.
    { tx_field = "max_priority_fee_per_gas", min = "0x2540be400", max = "0x4a817c800" },
]