EIP-7069 EXTCALL

Documentation for tests/osaka/eip7692_eof_v1/eip7069_extcall@206854b5.

Generate fixtures for these test cases for Osaka with:

fill -v tests/osaka/eip7692_eof_v1/eip7069_extcall --fork Osaka

Test cases for EIP-7069: Revamped CALL instructions

EIP-7069 proposes modifications to CALL instructions to align with the structured EOF format. Opcodes introduced: EXTCALL (0xF8), EXTDELEGATECALL (0xF9), EXTSTATICCALL (0xFB), RETURNDATALOAD (0xF7).