Add Go Test Suite to test GnoVM

[thehowl]

https://github.com/golang/go/tree/master/test

Probably to be done gradually, while trying how to correctly parse the format OR create adequate tools which can convert these tests into our own tests / filetests...

See-also #1215 #1115

[petar-dambovaliev]

A lot of the Go tests are not applicable to gnovm.
Probably looking at them manually is required. And if that is the case, while they are manually reviewed
they can be manually ported.

[moul]

What if we create a CI that doesn't require every test to pass? Instead, it could calculate the percentage of passing tests and only fail if that percentage decreases. Essentially, it would act like a "coverage report" but for Go compatibility.

The key benefit would be to provide not only the percentage but also a report that is useful for humans.