Add Component Slots to the Storefront Documentation

[henrijoss]

Scope

Add all available slots of a component to the Props tab documentation in the storefront.

Out of Scope

List topics that are not part of this task.

Notes

• Necessary Included infos: name, description, isRequired + requiredTagName, hasAlternativeProp
• Extend componentMeta and add SlotMeta type? Deprecate hasSlot, namedSlots and requiredNamedSlots
• Maybe rename Props to something like API?
• Maybe use the same format for slot documentation stencil supports for docs generation https://stenciljs.com/docs/docs-json#slots
  Example for p-flyout

/**
 * @slot header - Renders a sticky header section above the content area.
 * @slot - Default slot for the main content.
 * @slot footer - Shows a sticky footer section, flowing under the content area when scrollable.
 * @slot sub-footer - Shows a sub-footer section to display additional information below the footer. This slot is ideal for less critical content, such as legal information or FAQs, which provides further details to the user. It appears when scrolling to the end of the flyout or when there is available space to accommodate the content.
 */

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