refactor(types): widen Component type to include consutructor types

returned from `defineComponent`

ref: https://github.com/vuejs/vue-router-next/pull/421
also close #1880

Previous `Component` type is now exported as `ConcreteComponent`.

This introduces a minor breaking change when calling `h(comp, { ... })`
will now fail if `comp` is a of generic `Component` type, since it does
not specify what props it expects.

packages/runtime-core/src/hmr.ts

@@ -1,6 +1,6 @@
 /* eslint-disable no-restricted-globals */
 import {
-  Component,
+  ConcreteComponent,
   ComponentInternalInstance,
   ComponentOptions,
   InternalRenderFunction
@@ -10,7 +10,7 @@ import { extend } from '@vue/shared'
 
 export let isHmrUpdating = false
 
-export const hmrDirtyComponents = new Set<Component>()
+export const hmrDirtyComponents = new Set<ConcreteComponent>()
 
 export interface HMRRuntime {
   createRecord: typeof createRecord