feat: Add support for JS

[huntabyte]

This PR adds support for JavaScript.

Users can select whether they are using TypeScript or not via the init CLI prompt and the appropriate components/filenames/etc. will be added to their project when adding components.

This is accomplished by preprocessing the Svelte components and compiling the TS files into separate registry directories that are used for JS projects.

Before submitting the PR, please make sure you do the following

• If your PR isn't addressing a small fix (like a typo), it references an issue where it is discussed ahead of time and assigned to you. In many cases, features are absent for a reason.
• Prefix your PR title with feat:, fix:, chore:, or docs:.
• This message body should clearly illustrate what problems it solves.
• Follows the contribution guidelines.
• Format & lint the code with pnpm format and pnpm lint

[changeset-bot]

🦋 Changeset detected

Latest commit: 256f11e

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 2 packages

Name	Type
shadcn-svelte	Minor
playground-js	Patch

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