New Library project type from svelte-create

[niktek]

There is a new option now for npm create svelte@next that adds a library project type.

I've done a diff on the two project structures and the main things we should look at are:

package.json:
"build": "svelte-kit sync && svelte-package" which presumably ensures that the types are properly generated before the packaging is done.

tsconfig.json
"moduleResolution": "NodeNext" under compilerOptions.

I've done a test of these settings in Skeleton and there doesn't seem to be any issues at first glance.