Increase code coverage to an acceptable level

[fmorency]

Code coverage currently sits at 35.7%, which is low.

Edit: poa and tokenfactory modules coverage sit at 53.9% and 39.9% respectively. See strangelove-ventures/poa#148 and strangelove-ventures/tokenfactory#5

[fmorency]

The interchaintest tests are calling the manifestd binary a lot. This is currently not tracked in the coverage report.

Idea: Instrument manifestd with coverage support and retrieve the coverage data. Merge this coverage data with unit test coverage data.

It works when using bare Docker but not via interchaintest

I'm not sure how to continue.

• I modified interchaintest to propagate chain environment variables so that GOCOVERDIR behaves correctly: https://github.com/fmorency/interchaintest/tree/chain-env
• I added a method to retrieve the coverage data at the end of a given test (using client.CopyFromContainer())

The problem is that the retrieved coverage data is empty.

I think I need a mechanism to be able to retrieve the coverage data from every temporary container spawned by interchaintest and not only from the "main" test container.

[fmorency]

See #45. Should improve the coverage by a lot.

[fmorency]

#45 bumped the coverage to 60%. There is room for improvement, but we're off to a good start.