The conversion feature of the Global API is expected to be supported.

[wangsongc]

Is your feature request related to a problem? Please describe.
The conversion feature of the Global API is expected to be supported.

2.x Global API	3.x Instance API (app)
Vue.config	app.config
Vue.config.productionTip	removed (see below)
Vue.config.ignoredElements	app.config.compilerOptions.isCustomElement (see below)
Vue.component	app.component
Vue.directive	app.directive
Vue.mixin	app.mixin
Vue.use	app.use (see below)
Vue.prototype	app.config.globalProperties (see below)
Vue.extend	removed (see below)

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