feat: support v-bind .prop & .attr modifiers

Also allows render function usage like the following:

```js
h({
  '.prop': 1, // force set as property
  '^attr': 'foo' // force set as attribute
})
```

packages/runtime-dom/__tests__/patchProps.spec.ts

@@ -171,6 +171,20 @@ describe('runtime-dom: props patching', () => {
     patchProp(el, 'type', 'text', null)
   })
 
+  test('force patch as prop', () => {
+    const el = document.createElement('div') as any
+    patchProp(el, '.x', null, 1)
+    expect(el.x).toBe(1)
+  })
+
+  test('force patch as attribute', () => {
+    const el = document.createElement('div') as any
+    el.x = 1
+    patchProp(el, '^x', null, 2)
+    expect(el.x).toBe(1)
+    expect(el.getAttribute('x')).toBe('2')
+  })
+
   test('input with size', () => {
     const el = document.createElement('input')
     patchProp(el, 'size', null, 100)