Add Support for GrayGlacier (EIP-5133) in evm t8n

[marioevz]

Required to fill difficulty tests for the upcoming Gray Glacier difficulty bomb fork:
Execution Specs PR: https://github.com/ethereum/execution-specs/pull/537/commits
EIP-5133: https://eips.ethereum.org/EIPS/eip-5133

[karalabe]

I guess this is done now.