Expose the Forms in document.forms

[juandiegombr]

Is your feature request related to a problem? Please describe.
I am creating a React app that uses @conform-to/react to manage the forms.

In the new v1 version it is using document.forms but it is not implemented by happy-dom.

That blocks me in order to use happy-dom to test it.

Describe the solution you'd like
That document.forms returns the list of forms instead of undefined

Describe alternatives you've considered
I can't test it as this is how that library implements the useForm hook.

Additional context
DOCS: https://developer.mozilla.org/en-US/docs/Web/API/Document/forms