Add timeout prop to loading components

[WiXSL]

Problem

Some loading components have a one second hard-coded wait before rendering

Solution

I've simply added a timeout optional prop, default to 1 second
Fixes #10835

Additional Checks

• The PR targets next for a feature
• The PR includes unit tests (if not possible, describe why)
• The PR includes one or several stories (if not possible, describe why)
• The documentation is up to date

[fzaninotto]

Thanks! Would you mind updating the doc to allow users to discover this setting?

[WiXSL]

Thanks! Would you mind updating the doc to allow users to discover this setting?

Sure, but where exactly do I add the docs? I can't find a good place.

[fzaninotto]

Good point! Which leads me to the question: How can anyone use these new props? DataTable and SimpleList don't expose their loading component.

[WiXSL]

Good point! Which leads me to the question: How can anyone use these new props? DataTable and SimpleList don't expose their loading component.

Mmm, you are right!
It is true that they don't expose these components, but they get exported.
I already did this with the Loading component to be able to re-use it.

Maybe the best solution is to add a loading prop to SimpleList, DataTable, and Datagrid components to be able to expose the loading component (in another PR) and merge this one as is.
What do you think?