feat: consider EIP-7623 floor gas in message queue

[Thegaram]

EIP-7623 introduces a new floor gas, in addition to the existing intrinsic gas.

L1 messages must be processed and cannot be skipped. That means that L1 messages cannot fail the gas checks on L2. We ensure this by requiring a conservative minimum gas limit on L1.

This part of the EIP-7623 spec shows that we need to change the conservative per-byte gas multiplier from 16 to 40.

tokens_in_calldata = zero_bytes_in_calldata + nonzero_bytes_in_calldata * 4
intrinsic_gas = 4 * tokens_in_calldata
floor_gas = 10 * tokens_in_calldata
gas = 21_000 + max(intrinstic_gas, floor_gas)