stream: fix Readable stream state properties

Looks like they have been accidentally moved in
nodejs#31144. This also adds the proxy
properties to Readable since they have been present all this time
and removing them would be breaking.

lib/_stream_readable.js

@@ -1215,6 +1215,22 @@ ObjectDefineProperties(Readable.prototype, {
     }
   },
 
+  pipesCount: {
+    enumerable: false,
+    get() {
+      return this._readableState ? this._readableState.pipesCount : 0;
+    }
+  },
+
+  paused: {
+    enumerable: false,
+    get() {
+      return this._readableState ? this._readableState.paused : false;
+    }
+  }
+});
+
+ObjectDefineProperties(ReadableState.prototype, {
   // Legacy getter for `pipesCount`
   pipesCount: {
     get() {