feat: add genesis packages with transaction signing

[Villaquiranm]

closes #1104

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[Gno2D2]

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[codecov]

Codecov Report

Attention: Patch coverage is 80.43478% with 9 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
gno.land/pkg/integration/signer.go	64.70%	4 Missing and 2 partials ⚠️
gno.land/pkg/integration/pkgloader.go	50.00%	2 Missing and 1 partial ⚠️

📢 Thoughts on this report? Let us know!

[zivkovicmilos]

Overall it looks good 💯

I've left some improvement comments, and we should be good to go 🙏