Add UpgradeError rpc to 04-channel query service

[damiannolan]

Summary

Return the ErrorReceipt stored in state for the provided port and channel identifiers.

• Add the request and response protobuf message types for querying error receipts.
• Add the UpgradeError rpc to the Query service.
• Implement the query handler in the 04-channel submodule.

rpc UpgradeError(QueryUpgradeErrorRequest) returns (QueryUpgradeErrorResponse) {
    option (google.api.http).get = "/ibc/core/channel/v1/channels/{channel_id}/ports/{port_id}/upgrade_error";
}

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[colin-axner]

Should we call the grpc ErrorReceipt? To avoid name conflict with the UpgradeError type?

[colin-axner]

It looks like this issue can be closed?

[damiannolan]

Yep, let's close this. Looks like it slipped under the radar as merges to feat branch don't auto close the issue.

Implemented in #3367