feat(eslint-plugin): add new rule: enforce-class-compile (#3505)

[levchak0910]

This ESLint rule can help with the code base migration to transformer-compile-class, closes #3505

Currently only Vue files supported, since I didn't work with Svelte and JSX hence I may not know all usage scenarios. If this PR accepted, I will file two new issues with ask to help implement support for those files too.

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[antfu]

Can we have some tests to it? Thanks

[levchak0910]

Yes, I can add.
I didn't add them initially because I didn't find a prepared lib/code for it. I will add mocha and tests for this rule later.
Thanks )

[jacob-8]

Currently only Vue files supported, since I didn't work with Svelte and JSX hence I may not know all usage scenarios. If this PR accepted, I will file two new issues with ask to help implement support for those files too.

I would recommend not opening an issue for help in doing this with Svelte unless a Svelte user specifically does it themselves. The reason is that if someone is looking to save on size with compilation mode then they're probably already using the svelte-scoped mode which automatically compiles all UnoCSS. I would also recommend not opening an issue for JSX to ask for help. If no one wants it and no one is there to help then it's just noise. If someone wants it, then encourage them to open a PR and do it. I've updated your doc additions to reflect these thoughts.