Web Inspector: Support ES2022 Private Methods

[Rob Palmer]

Created attachment 450325 [details]
Private fields and methods are missing

The Web Inspector should support showing ES2022 class private fields, methods & accessors when inspecting an object instance in the Console.

Currently when we run the following code in the Web Inspector Console, the output shows **public** fields & methods, but not private ones.

```
    class Foo {
        public = 'public';
        #private = 'private';

        publicMethod() {}
        #privateMethod() {}
    }
    new Foo();    // Inspect the Console output now
```

[Radar WebKit Bug Importer]

<rdar://problem/88527162>