fix: ref of the responsive container

[HHongSeungWoo]

Description

I enabled access to both ref.current and ref.current.current, and added a warning when accessing ref.current.current.
also the type changed to union.

Related Issue

#3718

Motivation and Context

How Has This Been Tested?

Screenshots (if appropriate):

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

• My code follows the code style of this project.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have added tests to cover my changes.
• I have added a storybook story or extended an existing story to show my changes
• All new and existing tests passed.

[ckifer]

this returns a proxy object which will break users that currently have ref.current.current int their code

    React.useEffect(() => {
      if (ref) {
        console.log(ref.current.current);
        console.log(ref.current.current.children);
      }
    }, [ref]);

This works in TypeScript, but it does not execute because current.current is a proxy object

[HHongSeungWoo]

@ckifer Could you please try it once again???

[ckifer]

not sure this works

[ckifer]

yep! that works