WIP feat: add support of testing.T based tests with gnodev test

[moul]

• adds support of testing.T-style tests on gnodev test

[moul]

I have an issue, to run the test suites from gnodev instead of go test, I need to call some internal code from Golang, i.e.,

• https://github.com/golang/go/blob/go1.17.10/src/testing/internal/testdeps/deps.go

1. It will require build constraints to support both go1.17 and go1.18 (go1.18 adds support for fuzzing in the struct); so it will be complex to write and maintain.
2. in terms of the license, the go internal codebase is using a BSD-style license, and I need to know if it may be an issue for Gno.

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Some options:

• do nothing (no testing.T-style tests in gnodev)
• do it, as said above
• find a hack, like generating a temporary _test.go file in the same folder, that allows to then call go test

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I'm confused tonight and need more time to think on it. But please, anyone, any advice is greatly welcomed:)

[moul]

Waiting for #208 that looks better

[moul]

Closing in favor of #208