feat(rpc): add engine api abstraction, rm AttributesValidator
#102
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This PR supercedes and replaces #98
Overview
AttributesValidator
trait because I don't think it will be useful since we need to work with the engine API anyway for other reasons, other than validating payloads: namely updating the fork choice and driving the EL forward.I believe the decision to remove the validator trait will pay off in the future because it allows us to work with the engine api more freely. However if it turns out to be a bad decision this can be reverted easily as well.