DRAFT: feat: add pnpm support

[Filipoliko]

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[Filipoliko]

I am not sure anymroe if adding prepare scripts is really needed, but when I was trying to make things work, this helped me fix pnpm install and how the packages were build in correct order. We can try to remove it and see if pnpm run build (from root) will work correctly.. according to documentation I believe it should.