CLI: Detect vite project, use vite builder automatically

[IanVS]

Issue:

What I did

This is intended to aid discoverability of the vite builder by automatically initializing a project with the vite builder if a vite config file is detected. It uses a similar approach of looking for a vite config file as vitest.

I could see also detecting whether to use the webpack5 builder, but I didn't do that here, it will fall back to webpack4, as before.

If a --builder option is explicitly provided, it will be used and autodetection won't run.

This also cleans up a few other things, which I can remove if desired:

1. No longer logs Not using community vite builder, skipping after init, since the distinction between the community vite builder and official vite builder is subtle and might be confusing to users setting up a new storybook project.
2. Added a newline after messages like Adding Storybook support to your "React" app, since otherwise npm overwrote them once it started installs.

The logs now look something like this:

▶ npx sb@next init

 sb init - the simplest way to add a Storybook to your project.

 • Detecting project type. ✓
    Detected vite project, setting builder to @storybook/builder-vite
 • Adding Storybook support to your "React" app
(#########⠂⠂⠂⠂⠂⠂⠂⠂⠂) ⠋ idealTree:@storybook/builder-vite: sill fetch manifest unfetch@^4.2.0

How to test

• Is this testable with Jest or Chromatic screenshots?
• Does this need a new example in the kitchen sink apps?
• Does this need an update to the documentation?

Without some vite examples for e2e tests, I'm not sure how to write automated tests for this. I did test it out locally, though, and it worked great.

[nx-cloud]

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✅ Successfully ran 1 target

• nx run-many --target=prepare --all --parallel --max-parallel=15 -- --optimized

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[IanVS]

Hmmm, I can't tell why nx is failing here. yarn bootstrap --core works fine on my own machine...

[shilman]

LGTM -- great stuff @IanVS ❤️