Support Ordered Channels

[ethanfrey]

Depends on #46 (blocked)

Not so sure what is needed to be done here. In the normal case, I think we will relay all packets in order. Let's ensure they are sorted by (channel, sequence).

However, we will need to be careful (1) we filter out packets - we cannot skip on ordered channels and (2) if a packet is timed-out, we need to submit that before the packet to relay. So, most low-level primitives should work the same, but the higher-level ones may need some adjustment

[okwme]

Would love to know more about when this feature might become available. it's a necessary feature for interchain accounts to be ale to use the ts-relayer (cc @seantking)

[ethanfrey]

The priority depends on how urgently the interchain accounts will be on the cosmos hub. Or any mainnet actually.

Maybe we can chat a bit about all the schedule of the various external moving parts (outside of github). It could be the next non-bugfix feature we work on if this will be deployed soon.