test(gnovm): test performance improvements

[thehowl]

Fix master CI runs, and miscellaneous improvements locally, too.

• ci: switch to using -covermode=set rather than atomic, as it significantly degrades performance while not being shown on codecov. more info
• gnolang tests: use t.Parallel() to parallelize known "long" tests, both in -short and long versions.
• stdlibs: provide unicode native shims for some common functions used in some standard library tests. This may lead to some small inconsistencies between on-chain behaviour and off-chain should the unicode packages diverge; but I think we might we might want to consider a native-based unicode stdlib, anyway.
• thanks to these improvements, there is no longer the need to run -short on PRs, as the CI runs in ~9 mins, ie. 8 minutes less than the gno.land tests.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

📢 Thoughts on this report? Let us know!

[Gno2D2]

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[thehowl]

The tests are "slower" now because, putting stdlibs and filetests in /gnolang rather than /tests, code coverage is tracked more "correctly" (ie. filetests count towards the coverage), but running filetests and stdlib tests with coverage enabled on all pkg/gnolang has a big performance cost (-short -v on my machine):

ok      github.com/gnolang/gno/gnovm/pkg/gnolang        27.157s  # no coverage
ok      github.com/gnolang/gno/gnovm/pkg/gnolang        51.866s  # -covermode=set
ok      github.com/gnolang/gno/gnovm/pkg/gnolang        64.649s  # -covermode=count
ok      github.com/gnolang/gno/gnovm/pkg/gnolang        174.701s # -covermode=atomic

Currently, we are running with -covermode=atomic; I'm switching to -covermode=set, as codecov doesn't even allow to see the number of times a line was covered; so we can relegate analysis on specific lines to manual inspection when necessary.

[thehowl]

@gfanton, the ball is now onto you to lower the tests in gno.land down to ~10 mins ;)

[mvertes]

looks good to me