feat(gnovm): gnomod.toml add new field `draft`

[MikaelVallenet]

fix second task of #4370 depends on #4407 (approved but not merged yet)

[Gno2D2]

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[codecov[bot]]

Codecov Report

Attention: Patch coverage is 43.33333% with 17 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
gnovm/pkg/gnolang/gotypecheck.go	15.00%	14 Missing and 3 partials :warning:

:loudspeaker: Thoughts on this report? Let us know!

[leohhhn]

related: https://github.com/gnolang/gno/pull/4409