Add NPM support, please

[bogdanbiv]

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Given Deno now supports installing packages from NPM, https://deno.land/manual@v1.29.1/node, it would be nice if Trex supported this too.

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Please support npm protocol as a source for packages, parse npm:hello...

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installing myself,

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Would allow porting tools such as storybook that depend on NPM.

[DragonZV]

Indeed, I require this feature as well.

[ghaerdi]

I think --npm flag to install npm dependencies but not sure what would be the short version. -n is for --nest. Just --npm?

[RivierGrullon]

I think we can just put --npm @ghaerdi