refactor(reactivity): adjust APIs

BREAKING CHANGE: Reactivity APIs adjustments:

- `readonly` is now non-tracking if called on plain objects.
  `lock` and `unlock` have been removed. A `readonly` proxy can no
  longer be directly mutated. However, it can still wrap an already
  reactive object and track changes to the source reactive object.

- `isReactive` now only returns true for proxies created by `reactive`,
   or a `readonly` proxy that wraps a `reactive` proxy.

- A new utility `isProxy` is introduced, which returns true for both
  reactive or readonly proxies.

- `markNonReactive` has been renamed to `markRaw`.

packages/runtime-test/src/nodeOps.ts

@@ -1,4 +1,4 @@
-import { markNonReactive } from '@vue/reactivity'
+import { markRaw } from '@vue/reactivity'
 
 export const enum NodeTypes {
   TEXT = 'text',
@@ -88,7 +88,7 @@ function createElement(tag: string): TestElement {
     tag
   })
   // avoid test nodes from being observed
-  markNonReactive(node)
+  markRaw(node)
   return node
 }
 
@@ -106,7 +106,7 @@ function createText(text: string): TestText {
     text
   })
   // avoid test nodes from being observed
-  markNonReactive(node)
+  markRaw(node)
   return node
 }
 
@@ -124,7 +124,7 @@ function createComment(text: string): TestComment {
     text
   })
   // avoid test nodes from being observed
-  markNonReactive(node)
+  markRaw(node)
   return node
 }