[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>

scripts/supportedsites.py

@@ -122,6 +122,7 @@ CATEGORY_MAP = {
     "pornpics"       : "PornPics.com",
     "pornreactor"    : "PornReactor",
     "readcomiconline": "Read Comic Online",
+    "redbust"        : "RedBust",
     "rbt"            : "RebeccaBlackTech",
     "redgifs"        : "RedGIFs",
     "rozenarcana"    : "Rozen Arcana",
@@ -334,6 +335,9 @@ SUBCATEGORY_MAP = {
         "post"           : "Individual Posts",
         "shorturl"       : "",
     },
+    "redbust": {
+        "gallery": ("Galleries", "Categories"),
+    },
     "redgifs": {
         "collections": "",
     },