Investigate if & how slots can inherit props & how to only allow certain components in a slot

[thrbnhrtmnn]

Description / User Story

With #387 we now have the first component to use slots. What we have not figured out yet is if and how components that have been placed inside a slot can inherit props like theme or size from the "parent" component.

What we also have not figured out is if and how we can only allow certain components to be placed inside a slot.

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Acceptance Criteria

• [ ] An answer has been found to the question: if and how components that have been placed inside a slot can inherit props like theme or size from the "parent" component.
• [ ] An answer has been found to the question: if and how we can only allow certain components to be placed inside a slot.
• [ ] If there is no technical solution, we may need to update the components documentation in storybook to explain why i.e. changing a sizeVariant prop does not change the size of the components used in the slots.

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Background information

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[thrbnhrtmnn]

Might not be possible, and if it is possible, it may even not be a good idea. We moved the task to the backlog in todays planning.

[thrbnhrtmnn]

We stumbled upon a solution how this might still be possible: https://stackoverflow.com/questions/58169882/call-litelement-method-from-outside-the-element

This was found when looking into validation.