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.

test-dts/defineComponent.test-d.tsx

@@ -1,5 +1,6 @@
 import {
   describe,
+  Component,
   defineComponent,
   PropType,
   ref,
@@ -179,6 +180,8 @@ describe('with object props', () => {
     }
   })
 
+  expectType<Component>(MyComponent)
+
   // Test TSX
   expectType<JSX.Element>(
     <MyComponent
@@ -205,6 +208,17 @@ describe('with object props', () => {
     />
   )
 
+  expectType<Component>(
+    <MyComponent
+      b="b"
+      dd={{ n: 1 }}
+      ddd={['ddd']}
+      eee={() => ({ a: 'eee' })}
+      fff={(a, b) => ({ a: a > +b })}
+      hhh={false}
+    />
+  )
+
   // @ts-expect-error missing required props
   expectError(<MyComponent />)