[girlsreleased] add support (#6200)

* [girlsreleased] add support
* Lint
* Change "galleries" to "sets"
    As it is on the site
* Add pagination
    Add tests
* Fix tests
* Remove leftover print()
* Don't remove first set
* Yield pages
* Add filename metadata
* [girlsreleased] Refactor
* Return models as array
* Add filename numbering
    Add date metadata
* Add URL metadata
* Spawn set extractor the right way
* Adjust model/site regex
* update
    - restructure some code
    - remove constructors
    - use f-strings
* expand tests
* update docs/supportedsites

test/results/girlsreleased.py

@@ -0,0 +1,63 @@
+# -*- coding: utf-8 -*-
+
+# This program is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License version 2 as
+# published by the Free Software Foundation.
+
+from gallery_dl.extractor import girlsreleased
+
+
+__tests__ = (
+{
+    "#url"     : "https://girlsreleased.com/set/32332",
+    "#category": ("", "girlsreleased", "set"),
+    "#class"   : girlsreleased.GirlsreleasedSetExtractor,
+    "#pattern" : r"https://imx\.to/i/\w+",
+    "#count"   : 122,
+
+    "id"        : "32332",
+    "title"     : "Monadiko",
+    "model"     : ["Mia Sollis"],
+    "site"      : "sexart.com",
+    "date"      : "dt:2014-07-27 07:57:19",
+},
+
+{
+    "#url"     : "https://girlsreleased.com/set/124943",
+    "#category": ("", "girlsreleased", "set"),
+    "#class"   : girlsreleased.GirlsreleasedSetExtractor,
+    "#pattern" : r"https://imx\.to/i/\w+",
+    "#count"   : 79,
+
+    "id"        : "124943",
+    "title"     : "124943",
+    "model"     : ["Iveta"],
+    "site"      : "errotica-archives.com",
+    "date"      : "dt:2022-02-21 14:08:32",
+},
+
+{
+    "#url"     : "https://girlsreleased.com/model/11545/Ariana%20Regent",
+    "#category": ("", "girlsreleased", "model"),
+    "#class"   : girlsreleased.GirlsreleasedModelExtractor,
+    "#results" : (
+        "https://girlsreleased.com/set/142691",
+        "https://girlsreleased.com/set/142690",
+    ),
+},
+
+{
+    "#url"     : "https://girlsreleased.com/site/amourangels.com",
+    "#category": ("", "girlsreleased", "site"),
+    "#class"   : girlsreleased.GirlsreleasedSiteExtractor,
+},
+
+{
+    "#url"     : "https://girlsreleased.com/site/femjoy.com/model/854/Gabi",
+    "#category": ("", "girlsreleased", "site"),
+    "#class"   : girlsreleased.GirlsreleasedSiteExtractor,
+    "#pattern" : girlsreleased.GirlsreleasedSetExtractor.pattern,
+    "#count"   : 17,
+},
+
+)