[I] Add a collapsible panel component to wicket-extensions [wicket]

["reiern70 (via GitHub)" <gi...@apache.org>]

reiern70 opened a new issue, #1636:
URL: https://github.com/apache/wicket/issues/1636

    Pages often carry content that only some users need all the time: long explanations,
     help texts, advanced filter forms, details below a summary. Applications build their own
     show/hide toggles for this again and again, usually with inline JavaScript or inline
     styles, both of which a strict Content Security Policy blocks.
   
     Proposal: a small, independent component in wicket-extensions that renders a title and a
     body which the user can expand and collapse.
   
     - collapsed by default, with an API to render it expanded
     - built on the native <details>/<summary> elements: works without JavaScript, is keyboard
       accessible and announced correctly by screen readers, and needs no inline script or style
     - the title is a model, the body any component, so it can hold static text, a panel or a
       form
     - optionally reports the open state to the server, so it survives a re-render of the page
     - styled with its own CSS, easy to override


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