gno test -cover ...

[moul]

Implement a basic code coverage support, and setup CI/CD to start monitoring the coverage status of internal components, through testing the examples/ and gnovm/tests directories.

Bounty Requirements

• Within the GnoVM, a system is added which keeps a tally of the lines executed
  • Ideally this should be similar to Go's, where simple "increment" statements are added to the appropriate lines; this way the addition of the feature doesn't impact the normal execution performance of the GnoVM
  • Upon investigation, a different approach can be taken if necessary
• In the gno test command, after each package is tested, if the -cover flag is passed, the VM prints a simple percentage of the covered lines, like the result of go test:

  ok      gno.land/p/demo/...    0.035s  coverage: 75.1% of statements
  

• what -cover considers a statement to cover should match what Go considers
  • ie. transpiling the source of a Gno program into Go (gno transpile), then running tests, should yield the same %.

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Bounty Size: L; expected maximum reward: $4,000.

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