feat(forks): Add gas costs functions

[marioevz]

🗒️ Description

Introduce gas-calculating functions in the fork object, which are updated for each fork:

• memory_expansion_gas_calculator: Calculates the cost of expanding the memory from a starting memory length to a new memory length. Unchanged since Frontier fork.
• calldata_gas_calculator: Calculates the intrinsic gas cost of a transaction calldata, given the amount of zero and non-zero bytes in it. Changed in Istanbul fork (not directly but due gas_costs().G_TX_DATA_NON_ZERO reduction).
• transaction_intrinsic_cost_calculator: Calculates the intrinsic gas cost of a transaction given the calldata, whether the transaction is contract creating, the access list, and the number of authorizations. Updated for Homestead, Berlin and Prague forks.
• gas_costs: returns an Enum containing all gas-related constants.

This PR should make the implementation of the TransactionTest spec type easier (#933).

🔗 Related Issues

✅ Checklist

• All: Set appropriate labels for the changes.
• All: Considered squashing commits to improve commit history.
• All: Added an entry to CHANGELOG.md.
• All: Considered updating the online docs in the ./docs/ directory.
• Tests: All converted JSON/YML tests from ethereum/tests have been added to converted-ethereum-tests.txt.
• Tests: A PR with removal of converted JSON/YML tests from ethereum/tests have been opened.
• Tests: Included the type and version of evm t8n tool used to locally execute test cases: e.g., ref with commit hash or geth 1.13.1-stable-3f40e65.
• Tests: Ran mkdocs serve locally and verified the auto-generated docs for new tests in the Test Case Reference are correctly formatted.

[danceratopz]

Really impressive!