refactor(ethereum_clis): move TransitionTool.verify_fixture() to StateTest and BlockTest

[danceratopz]

🗒️ Description

This PR refactors ethereum_clis and the consume direct interface so that it can be extended to other clients.

Previously, the GethTransitionTool class implemented fixture consumption and referred to it as "fixture verification". The reason is historical: the first "consumer" was implemented in fill.

This PR:

• Adds GethStatetest and GethBlocktest interface consumer classes to the evm statetest, respectively evm_blocktest commands.
• Adds a GethFixtureConsumer class which applies the appropriate consumer class for the fixture to run against the client.

Note, that as we now instantiate the GethStatetest and GethBlocktest classes from within GethFixtureConsumer we don't currently use any of the binary detection/automatic subclass instantiation provided by EthereumCLI that is used for the TransitionTool.

🔗 Related Issues

None.

✅ Checklist

• All: Set appropriate labels for the changes.
• All: Considered squashing commits to improve commit history.
• All: Added an entry to CHANGELOG.md.