Bring back SwingBuilder widgets list

While Codehaus was still hosting the Groovy documentation, there was an [alphabetical widgets list](https://web.archive.org/web/20140702234519/http://groovy.codehaus.org/Alphabetical+Widgets+List) for the `SwingBuilder` DSL plus detail pages, e.g. for [`tabbedPane`](https://web.archive.org/web/20140702235752/http://groovy.codehaus.org/SwingBuilder.tabbedPane). Now, I can only find those pages on archive.org. Please bring that lost part of the documentation back into the main Groovy documentation. It is super difficult to discover the available widgets and their paramateters from an IDE, especialls for developers who are not Swing buffs already. IntelliSense in my IDE does not help much there. `SwingBuilder` is still available in a Groovy module even in Groovy 4, so it would make sense to documents it, too.

Start by reviewing the archived Alphabetical Widgets List and the linked SwingBuilder.tabbedPane detail page to identify the documentation that was lost. Restore an accessible widgets list and corresponding detail documentation in the main Groovy documentation, covering widget parameters and making SwingBuilder widgets discoverable.

Written by the indexing model from the issue text.