Validate IBC event types

[sug0]

IBC event types are currently not being validated. We should check if they are valid event types, using ibc-rs.

namada/crates/ibc/src/event.rs

Lines 143 to 161 in 4ed6229

	fn validate_ibc_event_type(
	namada_event: &Event,
	) -> Result<IbcEventType, EventError> {
	if namada_event.kind().domain() != IbcEvent::DOMAIN {
	return Err(EventError::InvalidEventType);
	}
	let event_type = namada_event.kind().sub_domain();
	// if !matches!(
	// event_type,
	// // TODO: add other ibc event types that we use in namada
	// "update_client" | "send_packet" | "write_acknowledgement"
	//) {
	// return Err(EventError::InvalidEventType);
	//}
	Ok(IbcEventType(event_type.to_owned()))
	}

[yito88]

We can remove the validation by #3317