Maybe we need Store SendPacket interface

[DaviRain-Su]

Feature Summary

According:

• WriteAcknowledgement core handler always write an acknowledgement when one isn't present #379
• RecvPacket core handler should always store the receipt when none is present in the store #378

Proposal

[plafer]

Could you expand on what you mean by a "Store SendPacket interface"?

[DaviRain-Su]

Could you expand on what you mean by a "Store SendPacket interface"?

It is used to find SendPacket in relayer, so it is recommended to add a function to save SendPacket in channelKeepr trait