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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    ├── 🟢 The base branch matches this pattern: ^master$
    └── 🟢 The pull request was created from a fork (head branch repo: loren-osborn/gno)

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└── 🟢 Maintainer can modify this pull request

Pending initial approval by a review team member, or review from tech-staff

If

🟢 Condition met
└── 🟢 And
    ├── 🟢 The base branch matches this pattern: ^master$
    └── 🟢 Not (🔴 Pull request author is a member of the team: tech-staff)

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└── 🟢 If
    ├── 🟢 Condition
    │   └── 🟢 Or
    │       ├── 🔴 At least one of these user(s) reviewed the pull request: [jefft0 leohhhn n0izn0iz notJoon omarsy x1unix] (with state "APPROVED")
    │       ├── 🔴 At least 1 user(s) of the team tech-staff reviewed pull request
    │       └── 🟢 This pull request is a draft
    └── 🟢 Then
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The pull request description provides enough details

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└── 🟢 And
    ├── 🟢 Not (🔴 Pull request author is a member of the team: core-contributors)
    └── 🟢 Not (🔴 Pull request author is user: dependabot[bot])

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[codecov[bot]]

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 :warning:
gnovm/pkg/test/test.go	92.10%	2 Missing and 1 partial :warning:

:loudspeaker: Thoughts on this report? Let us know!

[loren-osborn]

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

[github-actions[bot]]

This PR is stale because it has been open 3 months with no activity. Remove stale label or comment or this will be closed in 3 months.