refactor(evm): review base and besu implementations of t8n evaluation via server

ethereum/execution-spec-tests#792 added support for the `ethereum-spec-evm-resolver` which changed the way EELS executes `t8n` (previously via entry point and file IO, now via socker communcation and a server) - so a `_evaluate_server()` method was added to the `TransitionTool` base class. Besu's transition tool class `BesuTransitionTool` overrides the base class `evaluate()` with a similar method to `TransitionTool::_evaluate_server()` that handles the communication to its `t8n-server`. We should see if we can reconcile the differences between these two evaluate server methods.