Function validate_4844_header_standalone

pub fn validate_4844_header_standalone(
    header: &Header,
) -> Result<(), ConsensusError>

Validates that the EIP-4844 header fields exist and conform to the spec. This ensures that:

• blob_gas_used exists as a header field
• excess_blob_gas exists as a header field
• parent_beacon_block_root exists as a header field
• blob_gas_used is less than or equal to MAX_DATA_GAS_PER_BLOCK
• blob_gas_used is a multiple of DATA_GAS_PER_BLOB
• excess_blob_gas is a multiple of DATA_GAS_PER_BLOB