feat: expose theme type var

[equt]

This PR takes a try to type Theme in all official packages correctly, instead of omitting it or setting it to any.

c.c. This should close #1270, and previous related PR #1002, #1003

Attentions Required

1. Currently, I type all themes as T, neither T extends {} nor T extends Record<string, unknown>, as this kind of restriction doesn't make any sense to me.
2. CI is broken, as there're several decisions that have to be made
3. Currently, @unocss/preset-uno is the default preset, this means we cannot type the them e as a generic. The below code is theoretically not correct.
   

   unocss/packages/unocss/src/vite.ts

   Lines 8 to 19 in 2180281

   	export default function UnocssVitePlugin<Theme extends {}>(
   	configOrPath?: VitePluginConfig<Theme> | string,
   	): Plugin[] {
   	return VitePlugin(
   	configOrPath,
   	{
   	presets: [
   	presetUno(),
   	],
   	},
   	)
   	}

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[antfu]

Maybe we should keep more expressive Theme instead of T

[equt]

I'm open to that. Without restriction provides more flexibility, and maybe some people are comfortable with that. I would suggest extracting the Theme interface to a standalone package then.

[equt]

@antfu is it ok to have the restriction that all themes should always extend the Theme exported from preset-mini?

(sorry for the ping, as I'd like to merge/close the PR ASAP since it has to involve all packages)

[stale]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions.

[smashercosmo]

Any plans to resurrect this PR?