fix(language-core): correct type and completion support of vue: event

[KazariEX]

<template>
  <Comp @vue:mounted="..." />
</template>

[pkg-pr-new]

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vue-component-meta

npm i https://pkg.pr.new/vuejs/language-tools/vue-component-meta@4969

vue-component-type-helpers

npm i https://pkg.pr.new/vuejs/language-tools/vue-component-type-helpers@4969

@vue/language-plugin-pug

npm i https://pkg.pr.new/vuejs/language-tools/@vue/language-plugin-pug@4969

@vue/language-core

npm i https://pkg.pr.new/vuejs/language-tools/@vue/language-core@4969

@vue/language-server

npm i https://pkg.pr.new/vuejs/language-tools/@vue/language-server@4969

@vue/language-service

npm i https://pkg.pr.new/vuejs/language-tools/@vue/language-service@4969

vue-tsc

npm i https://pkg.pr.new/vuejs/language-tools/vue-tsc@4969

@vue/typescript-plugin

npm i https://pkg.pr.new/vuejs/language-tools/@vue/typescript-plugin@4969

commit: 85d300b