feat(gnovm): Adds code coverage tracking to gno test (Addresses #1121)

[loren-osborn]

DRAFT PULL REQUEST

So far I have added very simple tests to gnovm/cmd/gno and gnovm/pkg/test for code coverage visibility in system. Submitting PR early to ease collaboration when beneficial.

[Gno2D2]

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[codecov]

Codecov Report

Attention: Patch coverage is 87.50000% with 6 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
gnovm/pkg/gnolang/machine.go	0.00%	3 Missing ⚠️
gnovm/pkg/test/test.go	92.10%	2 Missing and 1 partial ⚠️

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[loren-osborn]

Just noting that I only rebased this PR at @jaekwon's specific recommendation, as the project guidelines suggest against rebasing PRs.