[4844] Fix Data Gas Price Calculation

[Gabriel-Trintinalia]

PR description

This pull request addresses two issues: fixing the data gas price calculation and adjusting the genesis state methods to verify forks. The details of each issue are described below:

Data Gas Price Calculation

The previous implementation of data gas price calculation had a flaw. It only considered the parent's excessDataGas to determine the dataPricePerGas, which overlooked the data gas used by the parent header itself. Consequently, when a large number of transactions were sent and the gas price increased, blocks were generated with transactions that should not have been included due to their price.

To rectify this, the calculation now incorporates both the parent's excessDataGas and the data gas used by the parent header. The code snippet from the specification is provided below:

def get_data_gasprice(header: Header) -> int:
    return fake_exponential(
        MIN_DATA_GASPRICE,
        header.excess_data_gas,
        DATA_GASPRICE_UPDATE_FRACTION
    )

This modification ensures that the assertion in block creation and transaction processing considers the correct data gas price, preventing inclusion of transactions with insufficient data gas price.

Genesis State Verification for Cancun Fork

For the Cancun fork, there was an issue with the genesis state not including WithdrawsRoot in the genesis block. The problematic code snippet was as follows:

return shanghaiTimestamp.getAsLong() == genesis.getTimestamp();
To address this issue, the code has been updated as follows:

return genesis.getTimestamp() >= shanghaiTimestamp.getAsLong();

This change ensures that the genesis block's timestamp is greater than or equal to the shanghaiTimestamp, correctly reflecting the inclusion of WithdrawsRoot in the genesis state for the Cancun fork.