EIP-7516 Blobgasfee

Documentation for tests/cancun/eip7516_blobgasfee.

Generate fixtures for these test cases for Cancun with:

Cancun only:

fill -v tests/cancun/eip7516_blobgasfee --fork=Cancun --evm-bin=/path/to/evm-tool-dev-version

For all forks up to and including Cancun:

fill -v tests/cancun/eip7516_blobgasfee --until=Cancun --evm-bin=/path/to/evm-tool-dev-version

Tests for EIP-7516: BLOBBASEFEE opcode