Export default components so that they can be overriden easily

Description

I'd like to be able to use custom components only for certain cases such as:

• Images/Videos that are from a certain source
• Certain Embed types

more examples could be found.

The idea

const components = useMemo(() => {
   Embed: (props) => {
       if (props.smt === 'criteria') { return <div>something</div> }
       return <defaultComponents.Embed {...props} />
   }
}, [...]);

Notion Test Page ID

N/A

No file or test is named. Start at the package's public component entry point and locate how default components such as Embed, image, and video are defined and exported. Check the existing component customization path, then verify that consumers can import defaults and use them as fallbacks when overriding selected cases.