Calculate fee per blob gas

Calculate fee per blob gas. Add helpers and actual calculation methods:

• fake_exponential() cryptographic helper;
• calc_excess_blob_gas(): https://github.com/ethereum/EIPs/blob/master/EIPS/eip-4844.md#header-extension;
• add blob gas accounting function get_base_fee_per_blob_gas();
• calculate max_fee_per_blob_gas as base_fee_per_blob_gas * 1.1, reference to 1.1 explanation;
• update Net::Ethereum::get_fee_data() method to return maxFeePerBlobGas.

Credits

pheix-research/talks#22

Branch details

Implement the feature at calculate-fee-per-blob-gas branch