feat(swizzle): added a language prompt when no flag is provided

[yixiaojiu]

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Motivation

Following the issue https://github.com/facebook/docusaurus/issues/9402, I created a prompt that just shows up when neither --javascript or --typescript is passed

Usage screenshot

Related issues/PRs

https://github.com/facebook/docusaurus/issues/9402

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[slorber]

Thanks, LGTM 👍

This will be in v3.2

I refactored a bit, deduplicating the prompting util extracted in https://github.com/facebook/docusaurus/pull/9442

Also:

• asking for language after choosing theme
• do not prompt if theme only supports JS
• throw if theme only supports JS and user provides --typescript option