[redbust] add support (#6759 #6918 #7043)

* init - Redbust.com Support
* Added Test
    Could use a second set of eyes on this
* update 'gallery' extractor
    - extract more metadata
    - simplify image extraction
    - support legacy galleries
* add tests
* update 'image' extractor
* add 'tag' extractor
* add 'archive' extractor
* restrict 'image' extractor pattern
* update docs/supportedsites
* replace quotes inside f-string

---------

Co-authored-by: Mike Fährmann <mike_faehrmann@web.de>

docs/supportedsites.md

@@ -787,6 +787,12 @@ Consider all listed sites to potentially be NSFW.
     <td>Favorites, Pools, Posts, Tag Searches</td>
     <td></td>
 </tr>
+<tr>
+    <td>RedBust</td>
+    <td>https://redbust.com/</td>
+    <td>Archives, Galleries, Categories, individual Images, Tag Searches</td>
+    <td></td>
+</tr>
 <tr>
     <td>Reddit</td>
     <td>https://www.reddit.com/</td>