Implement make canonical

[mattsse]

this currently goes unhandled

reth/crates/engine/tree/src/tree/mod.rs

Lines 964 to 975 in 1656327

	fn on_forkchoice_updated(
	&mut self,
	state: ForkchoiceState,
	attrs: Option<<Self::Engine as PayloadTypes>::PayloadAttributes>,
	) -> ProviderResult<TreeOutcome<OnForkChoiceUpdated>> {
	if let Some(on_updated) = self.pre_validate_forkchoice_update(state)? {
	self.state.forkchoice_state_tracker.set_latest(state, on_updated.forkchoice_status());
	return Ok(TreeOutcome::new(on_updated))
	}
	todo!()
	}

we need to

• make the head canonical
• process payload attributes if valid
• update in memory state etc