Support Async and ESM Plugins

[sxzz]

What problem does this feature solve?

@vue/language-tools now loads plugins using CJS require and enforces that plugins be in CJS format. Although node 22 supports require(ESM), it is still not fully supported in old versions.

Additionally, dynamically loading configurations (e.g., using importx / unconfig) for plugins remains unachievable.

Thus, supporting dynamic import and async plugins is necessary.

I guess we also need support from TypeScript team. Maybe we should have an issue on their repo?

What does the proposed solution look like?

export type VueLanguagePlugin = (ctx: ...) => Awaitable<Arrayable<VueLanguagePluginReturn>>;

[johnsoncodehk]

Closed since this can be solved on plugin side using jiti.