EIP-7251 Consolidations

Documentation for tests/prague/eip7251_consolidations.

Generate fixtures for these test cases for Prague with:

Prague only:

fill -v tests/prague/eip7251_consolidations --fork=Prague --evm-bin=/path/to/evm-tool-dev-version

For all forks up to and including Prague:

fill -v tests/prague/eip7251_consolidations --until=Prague --evm-bin=/path/to/evm-tool-dev-version

Cross-client EIP-7251 Tests