Allow PacketAcknowledgements to take in packet commitments for filtering

[colin-axner]

Summary

UnreceivedAcknowledgements currently takes in a list of acknowledgements and checks to see if the packet commitment still exists. The list of acknowledgements is obtained via a gRPC which returns all existing acknowledgements (even if the have been acknowledged on the sending chain). That gRPC should take in an optional list of packet commitments and only return acknowledgements for that list of packet commitments.

Problem Definition

The issue is acknowledgements live forever so it isn't sustainable to expect a relayer to be able to query for all ack sequences. Currently such a query returns ~64k sequences

Proposal

Add an additional field to the QueryPacketAcknowledgementsRequest which takes in a list of packet commitments. For each packet commitment, if the acknowledgement has been written, that sequence should be added to the array returned in the QueryPacketAcknowledgementsResponse

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[damiannolan]

@colin-axner This should remain backwards compatible right? If no commitments are included in the req, all should be added to the returned array as it works today, correct?

[colin-axner]

@colin-axner This should remain backwards compatible right? If no commitments are included in the req, all should be added to the returned array as it works today, correct?

yup!