Be able to pass the component loader to each svelte component

[freddyaboulton]

• I have searched to see if a similar issue already exists.

Is your feature request related to a problem? Please describe.
There are cases where a svelte component may need to load another component

• A Chatbot for displaying gradio components embedded into them
• A Dashboard custom component that loads several "@gradio/plot-components"

Describe the solution you'd like
The gradio prop can have a loader attribute that can load any core or registered custom component.

Additional context
Add any other context or screenshots about the feature request here.

[pngwn]

We also need this to make the Examples dynamic I think.