feat(gnovm): categorize imports

[n0izn0iz]

This makes the imports utils split imports by file kinds, allowing to make explicit decisions about what imports to use at the various callsites

• Create FileKind enum to categorize gno files, with variants Compiled, Test, Xtest and Filetest
• Create GetFileKind util to derive the FileKind from a file name and body
• Create ImportsMap type that maps FileKinds to lists of imports. It has a single method Merge to select and merge various imports from multiple FileKinds
• Modify thepackages.Imports helper to return an ImportsMap instead of a []string and adapt callsites by usingImportMap.Merge to preserve existing behavior

This is something I need for #3304 and #2932 but to help reviews I made an atomic PR here instead

[Gno2D2]

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Codecov Report

Attention: Patch coverage is 72.13115% with 17 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
gnovm/pkg/packages/imports.go	50.00%	14 Missing and 1 partial ⚠️
gnovm/pkg/doc/dirs.go	66.66%	1 Missing ⚠️
gnovm/pkg/gnomod/pkg.go	66.66%	1 Missing ⚠️

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