[catbox] add 'album' extractor (#2410)

adapted from https://github.com/mikf/gallery-dl/pull/2805

- rewrite using GalleryExtractor
- extract more metadata
- match lolisafe names
- add test

docs/supportedsites.md

@@ -109,6 +109,12 @@ Consider all sites to be NSFW unless otherwise known.
     <td>Albums</td>
     <td></td>
 </tr>
+<tr>
+    <td>Catbox</td>
+    <td>https://catbox.moe/</td>
+    <td>Albums</td>
+    <td></td>
+</tr>
 <tr>
     <td>Comic Vine</td>
     <td>https://comicvine.gamespot.com/</td>