Snippets with multiple files

I often come across a need for multiple files within a single snippet. A common use case for me is I have a team that shares a package.json along with a gulpfile.js. Both of these files work hand-in-hand with using Gulp.

Obviously, this isn't specific to Gulp in any way, but I wanted to illustrate the need. I'm sure basically every node-based project could benefit. Please assign the feature proposal label.

Design proposal

In preparation of #31128 (closed), these are our designs for snippets with multiple files. These already take over the new snippet design from #32714 (closed) and #31964 (closed).

Prototype

https://sketch.cloud/s/zbdro/a/lPP0lK/play

Snippets page

Empty state	List of snippets

New snippet form

Initial state	Markdown field expanded	Multiple files	Limit of 10 files

Snippet

Edit snippet

Embedded snippet with multiple files

If there are multiple files in a snippets, these different files will render right below each other when embedded on another page. There won't be a way to embed a single file from a multi-file snippet.

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