feat - adds testing scripts for ethereum//tests and execution spec tests

[debjit-bw]

Adds necessary handlers and drivers for testing with ethereum/tests and the new eels tests.

• We are skipping tests targeted at the following forks:
  • Frontier
  • Homestead
  • Byzantium
  • ByzantiumToConstantinopleAt5
  • Istanbul
  • Berlin
  • London
  • Constantinople
  • ConstantinopleFix
  • MergeEOF
  • MergeMeterInitCode
  • MergePush0

This DOES NOT mean that the features introduced at these forks are untested. Any feature introduced have tests targeted at all the forks after that, and we ARE testing for the fork "Merge" and later, skipping the ones before it.

• We are directly using the tests generated for Ethereum, since we don't currently have the tests generated for Gnosis.
  • Therefore, several tests are failing, particularly 1559, withdrawals etc.
  • For most tests however, Gnosis and Mainnet work similarly.
  • 53 out of the 71 tests (combining eest and ethereum/tests) are PASSING. For now I have feature-gated the failing tests.
  • 18 tests are inside failing-tests feature (25%).

This PR is targeted mostly at setting up the code needed to run the EELS or ethereum tests. The tests themselves will be kept updated as and when Gnosis tests are available. The tests currently passing is just to prove that we aren't doing anything wildly wrong.

[dapplion]

Excellent! Thank you