Create a WrapAcknowledgement function for backwards compatibility

[colin-axner]

Summary

In 05-port router, we want to get away from middlewares wrapping acknoweledgements of applications below them. Core IBC will instead maintain a map from app name to the ack for that application. To maintain backwards compatibility, core IBC needs to be capable of setting the acknowledgement in the format the counterparty expects.

We may need a Unwrap function, but it might be possible to have relayers pass in the flat map.

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[damiannolan]

This issue is more or less solved in #7176, but we will hold off on cherry-picking out the code separately for this for the time being until we are happy with the overall direction for OnRecvPacket.

Core IBC will instead maintain a map from app name to the ack for that application.

This will be also relevant for forwards compatibility for multi packetdata / mutli acknowledgements.

[colin-axner]

This issue is being closed as the team has decided to move in another direction #6941 (comment) - it will be reopened if necessary