EIP-3651 Warm COINBASE

Documentation for tests/shanghai/eip3651_warm_coinbase@pectra-devnet-4@v1.0.1.

Generate fixtures for these test cases for Prague with:

fill -v tests/shanghai/eip3651_warm_coinbase --fork Prague

Tests EIP-3651: Warm COINBASE

Tests for EIP-3651: Warm COINBASE.