Block Editor: URLInput compatibility in smaller containers

[ntsekouras]

By working on a different PR that was using URLInput component in Inspector controls, I observed that this component has some opinionated styles that don't allow the component to properly render in smaller containers.

At least some width styles like this one should be addressed and probably the hiding of suggestions dialog in smaller viewports.

Another good idea would be to be able to pass a ref that will later on be passed in the internal Popover instance as its anchor prop. Right now we need to add a wrapper to the component in order for the suggestions dialog to render properly.