fix: remove import cycles

[n0izn0iz]

Depends on #3323

• add test in examples/no_cycles_test.go to detect import cycles in stdlibs and examples
• add matchString native injection in the testing stdlib to avoid a cycle in regexp tests
• remove other import cycles

Go never allows import cycles. Our stdlibs have a lot of import cycles, and some examples import self which is not allowed in golang either.
Keeping support for import cycles in stdlib and importing self will require a lot of hacky and weird logic in generic package loading code so I try to tackle this first.

TODO:

• fix tests
• check cycles with the test stdlibs overlay applied -> be explicit about the lack of support for modifying imports in testing stdlibs overlay

[Gno2D2]

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Codecov Report

Attention: Patch coverage is 37.50000% with 5 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
gnovm/tests/stdlibs/testing/native_testing.go	50.00%	2 Missing and 1 partial ⚠️
gnovm/stdlibs/testing/testing.go	0.00%	2 Missing ⚠️

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[thehowl]

Some comments on the non-trivial changes, good overall.

[jefft0]

Removed the review/triage-pending label because this PR was reviewed by core dev thehowl.