feat: Enhanced Tailwind support inside CVA and cn

[ap-1]

This snippet inside of settings.json allows the Tailwind CSS extension to provide intellisense for the strings inside CVA. It has no effect if the Tailwind CSS extension is not installed, but I believe many of shadcn/ui's users already do. The same has been done for the cn() helper.

I also added a few more changes:

• The Tailwind CSS extension is now in the "recommendations" field in .vscode/extensions.json.
• There are now instructions to install the Tailwind CSS extension inside a new "Editor setup" docs page.
• cva is now in the list of callees in the eslint-plugin-tailwindcss settings.

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Name	Status	Preview	Comments	Updated (UTC)
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[its-monotype]

https://github.com/francoismassart/eslint-plugin-tailwindcss/blob/master/docs/rules/classnames-order.md#callees-default-classnames-clsx-ctl-cva-tv

[its-monotype]

And do not use "prettier-plugin-tailwindcss" and "eslint-plugin-tailwindcss" simultaneously, it can cause unreal lags in VSCode

[ap-1]

Depending on how #528 is implemented, we might require a couple changes here

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Latest commit: af87571c84d0381e7408e98b40d9e063f378b432

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[ap-1]

Relevant: https://github.com/joe-bell/cva/discussions/85#discussioncomment-5014769