no_std OP consensus rules

[emhane]

Describe the feature

Only OpBeaconConsensus rule set requires std (to use system time). Make the rest of the crate no_std compatible.

Additional context

No response

[mattsse]

I'm okay with removing this check:

reth/crates/optimism/consensus/src/lib.rs

Lines 183 to 192 in 28fde3f

	// Check if timestamp is in the future. Clock can drift but this can be consensus issue.
	let present_timestamp =
	SystemTime::now().duration_since(SystemTime::UNIX_EPOCH).unwrap().as_secs();
	if header.exceeds_allowed_future_timestamp(present_timestamp) {
	return Err(ConsensusError::TimestampIsInFuture {
	timestamp: header.timestamp,
	present_timestamp,
	})
	}

this was taken from the eth impl and we can remove this entirely

[mattsse]

ref #13041