EIP-7873 Tx CREATE

Documentation for tests/osaka/eip7692_eof_v1/eip7873_tx_create@fbd9cb20.

Generate fixtures for these test cases for Osaka with:

fill -v tests/osaka/eip7692_eof_v1/eip7873_tx_create --fork Osaka

abstract: Test cases for EIP-7873: TXCREATE and InitcodeTransaction.