[Logs] Add `timestamp` field to log envelope item

[AbhiPrasad]

https://github.com/getsentry/relay/blob/master/relay-server/src/services/processor/ourlog.rs#L53-L71

Need to update otel_to_sentry_log
https://github.com/getsentry/relay/blob/master/relay-ourlogs/src/ourlog.rs#L8

and adjust OurLog (with timestamp not in nanos) to LogKafkaMessage (has to be in nanos)

relay/relay-server/src/services/store.rs

Lines 964 to 991 in 0b1dbb2

	let mut log: LogKafkaMessage = match serde_path_to_error::deserialize(d) {
	Ok(log) => log,
	Err(error) => {
	relay_log::error!(
	error = &error as &dyn std::error::Error,
	"failed to parse log"
	);
	self.outcome_aggregator.send(TrackOutcome {
	category: DataCategory::LogItem,
	event_id: None,
	outcome: Outcome::Invalid(DiscardReason::InvalidLog),
	quantity: 1,
	remote_addr: None,
	scoping,
	timestamp: received_at,
	});
	self.outcome_aggregator.send(TrackOutcome {
	category: DataCategory::LogByte,
	event_id: None,
	outcome: Outcome::Invalid(DiscardReason::InvalidLog),
	quantity: payload.len() as u32,
	remote_addr: None,
	scoping,
	timestamp: received_at,
	});
	return Ok(());
	}
	};

[AbhiPrasad]

Being taken care of in #4592, closing this as such.