The swizzle CLI should prompt for TS usage

[slorber]

Have you read the Contributing Guidelines on issues?

• I have read the Contributing Guidelines on issues.

Motivation

When using the swizzle CLI, we can get TypeScript copies of the theme files, but this requires to provide the --typescript option ahead of time.

yarn workspace website swizzle // will always copy JS files

yarn workspace website swizzle --typescript // will copy TS files, if available

---

When running yarn workspace website swizzle, the CLI should more interactive and promp the user if they want to use TypeScript.

To disable the promp, a language should be provided explicitly:

yarn workspace website swizzle --javascript
yarn workspace website swizzle --typescript

---

Related to #9401 (DX should be consistent)

[mqshaikh8]

Is anyone working on this? I would love to work on this if no one took it yet