[pixiv] implement workaround for 'limit_sanity_level' works

(#4327, #4747, #5054, #5435, #5651, #5655)

Metadata should be ~95% identical (there might be some 'date' differences)
and there could be issues with R-18 works, as these require some URL
manipulation to transform /c/250x250_80_a2/ thumbnail URLs into
/img-original/ ones.

test/results/pixiv.py

@@ -184,11 +184,88 @@ __tests__ = (
 {
     "#url"     : "https://www.pixiv.net/artworks/85960783",
     "#comment" : "limit_sanity_level_360.png (#4327, #5180)",
-    "#category": ("", "pixiv", "work"),
     "#class"   : pixiv.PixivWorkExtractor,
+    "#options" : {"sanity": False},
     "#count"   : 0,
 },
 
+{
+    "#url"     : "https://www.pixiv.net/en/artworks/102932581",
+    "#comment" : "limit_sanity_level_360.png (#4327, #5180)",
+    "#class"   : pixiv.PixivWorkExtractor,
+    "#options" : {"sanity": True},
+    "#urls"    : "https://i.pximg.net/img-original/img/2022/11/20/00/00/49/102932581_p0.jpg",
+
+    "caption"       : "Meet a deer .",
+    "comment_access_control": 0,
+    "create_date"   : "2022-11-19T15:00:00+00:00",
+    "date"          : "dt:2022-11-19 15:00:00",
+    "date_url"      : "dt:2022-11-19 15:00:49",
+    "extension"     : "jpg",
+    "filename"      : "102932581_p0",
+    "height"        : 3840,
+    "id"            : 102932581,
+    "illust_ai_type": 1,
+    "illust_book_style": 0,
+    "is_bookmarked" : False,
+    "is_muted"      : False,
+    "num"           : 0,
+    "page_count"    : 1,
+    "rating"        : "General",
+    "restrict"      : 0,
+    "sanity_level"  : 2,
+    "series"        : None,
+    "suffix"        : "",
+    "title"         : "《 Bridge and Deer 》",
+    "tools"         : [],
+    "total_bookmarks": range(1900, 3000),
+    "total_comments": range(3, 10),
+    "total_view"    : range(11000, 20000),
+    "type"          : "illust",
+    "url"           : "https://i.pximg.net/img-original/img/2022/11/20/00/00/49/102932581_p0.jpg",
+    "visible"       : False,
+    "width"         : 2160,
+    "x_restrict"    : 0,
+    "image_urls"    : {
+        "mini"    : "https://i.pximg.net/c/48x48/custom-thumb/img/2022/11/20/00/00/49/102932581_p0_custom1200.jpg",
+        "original": "https://i.pximg.net/img-original/img/2022/11/20/00/00/49/102932581_p0.jpg",
+        "regular" : "https://i.pximg.net/img-master/img/2022/11/20/00/00/49/102932581_p0_master1200.jpg",
+        "small"   : "https://i.pximg.net/c/540x540_70/img-master/img/2022/11/20/00/00/49/102932581_p0_master1200.jpg",
+        "thumb"   : "https://i.pximg.net/c/250x250_80_a2/custom-thumb/img/2022/11/20/00/00/49/102932581_p0_custom1200.jpg",
+    },
+    "tags"          : [
+        "オリジナル",
+        "風景",
+        "イラスト",
+        "illustration",
+        "美しい",
+        "女の子",
+        "少女",
+        "deer",
+        "flower",
+        "spring",
+    ],
+    "user"          : {
+        "account"    : "805482263",
+        "id"         : 7386235,
+        "is_followed": False,
+        "name"       : "岛的鲸",
+        "profile_image_urls": {},
+    },
+},
+
+{
+    "#url"     : "https://www.pixiv.net/en/artworks/109487939",
+    "#comment" : "R-18 limit_sanity_level_360.png (#4327, #5180)",
+    "#class"   : pixiv.PixivWorkExtractor,
+    "#urls"    : [
+        "https://i.pximg.net/img-original/img/2023/07/01/00/06/28/109487939_p0.png",
+        "https://i.pximg.net/img-original/img/2023/07/01/00/06/28/109487939_p1.png",
+        "https://i.pximg.net/img-original/img/2023/07/01/00/06/28/109487939_p2.png",
+        "https://i.pximg.net/img-original/img/2023/07/01/00/06/28/109487939_p3.png",
+    ],
+},
+
 {
     "#url"     : "https://www.pixiv.net/en/artworks/966412",
     "#category": ("", "pixiv", "work"),