Add go.mod for 06-solomachine

[colin-axner]

Summary

Give the 06-solomachine its own go.mod and remove ibc-go's dependency on this module.

Problem Definition

06-solomachine is quite naturally a non-circular consumer of the ibc-go API/module, specifically the API defined by 02-client.

Not all chains are users of 06-solomachine and thus do not need to import 06-solomachine or rely on its dependency management.

The coupling of ibc-go with 06-solomachine is not particularly problematic at the moment and thus this issue should not be a priority as there are some issues with giving solomachine its own go.mod

ibc-go uses solomachine in testing:

• testing certain cases
• testing package has solomachine code

In order to decouple solomachine, on main improvement is better support for testing light clients in the testing library.

Proposal

Give the 06-solomachine its own go.mod and remove ibc-go's dependency on this module. As stated above, this is low priority and should only be taken up if it is painless to do. Opening as a signaling issue as over time we can begin removing the 06-solomachine dep from ibc-go

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For Admin Use

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• Appropriate labels applied
• Appropriate contributors tagged/assigned