feat(gnovm): add gno test parallel package testing

[gfanton]

This PR improves the speed of running gnovm tests.

• It separates gno stdlibs tests from gnovm go tests by using gno test directly in separate job on the CI.
• It adds parallel package test flags for gno test.

As a result, this PR reduces the test time of the gnovm test suite to below 5m.

[Gno2D2]

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Codecov Report

Attention: Patch coverage is 96.49123% with 2 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
gnovm/cmd/gno/test.go	96.49%	1 Missing and 1 partial ⚠️

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[moul]

It could be great to run tests in parallel within the same package as well. A recent change I made was to ensure each test is independent; if there is a global variable, it is always set up again. This is probably easy to implement.