feat(types): add type TemplateRef

[Shinigami92]

This adds "just" a type-alias so we can reduce some code when defining a template-ref.

Right now we would need to write code like:

import { useTemplateRef, type ShallowRef } from 'vue'
const myRef: Readonly<ShallowRef<typeof MyComp>> = useTemplateRef('myRef')

With the change we can reduce that to:

import { useTemplateRef, type TemplateRef } from 'vue'
const myRef: TemplateRef<typeof MyComp> = useTemplateRef('myRef')

This makes the code also a little bit more easier to read for newcomers to the project.

I use lefthandside types very often because this ensures that what the developer is wanted to receive here instead of just type what is there. A bit like ts eslint explicit-module-boundary-types

[github-actions]

Size Report

Bundles

File	Size	Gzip	Brotli
runtime-dom.global.prod.js	100 kB	37.9 kB	34.2 kB
vue.global.prod.js	158 kB	57.8 kB	51.4 kB

Usages

Name	Size	Gzip	Brotli
createApp (CAPI only)	46.3 kB	18.2 kB	16.6 kB
createApp	54.2 kB	21.1 kB	19.3 kB
createSSRApp	58.4 kB	22.9 kB	20.8 kB
defineCustomElement	59.1 kB	22.7 kB	20.7 kB
overall	68.3 kB	26.3 kB	23.9 kB

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commit: 3f7e6ca