[ie/hotstar] Extract `release_year` (#7869)

Authored by: Rajeshwaran2001

yt_dlp/extractor/hotstar.py

@@ -142,6 +142,26 @@ class HotStarIE(HotStarBaseIE):
             'duration': 1272,
             'channel_id': 3,
         },
+        'skip': 'HTTP Error 504: Gateway Time-out',  # XXX: Investigate 504 errors on some episodes
+    }, {
+        'url': 'https://www.hotstar.com/in/shows/kana-kaanum-kaalangal/1260097087/back-to-school/1260097320',
+        'info_dict': {
+            'id': '1260097320',
+            'ext': 'mp4',
+            'title': 'Back To School',
+            'season': 'Chapter 1',
+            'description': 'md5:b0d6a4c8a650681491e7405496fc7e13',
+            'timestamp': 1650564000,
+            'channel': 'Hotstar Specials',
+            'series': 'Kana Kaanum Kaalangal',
+            'season_number': 1,
+            'season_id': 9441,
+            'upload_date': '20220421',
+            'episode': 'Back To School',
+            'episode_number': 1,
+            'duration': 1810,
+            'channel_id': 54,
+        },
     }, {
         'url': 'https://www.hotstar.com/in/clips/e3-sairat-kahani-pyaar-ki/1000262286',
         'info_dict': {
@@ -154,6 +174,19 @@ class HotStarIE(HotStarBaseIE):
             'timestamp': 1622943900,
             'duration': 5395,
         },
+    }, {
+        'url': 'https://www.hotstar.com/in/movies/premam/1000091195',
+        'info_dict': {
+            'id': '1000091195',
+            'ext': 'mp4',
+            'title': 'Premam',
+            'release_year': 2015,
+            'description': 'md5:d833c654e4187b5e34757eafb5b72d7f',
+            'timestamp': 1462149000,
+            'upload_date': '20160502',
+            'episode': 'Premam',
+            'duration': 8994,
+        },
     }, {
         'url': 'https://www.hotstar.com/movies/radha-gopalam/1000057157',
         'only_matching': True,
@@ -288,6 +321,7 @@ class HotStarIE(HotStarBaseIE):
             'description': video_data.get('description'),
             'duration': int_or_none(video_data.get('duration')),
             'timestamp': int_or_none(traverse_obj(video_data, 'broadcastDate', 'startDate')),
+            'release_year': int_or_none(video_data.get('year')),
             'formats': formats,
             'subtitles': subs,
             'channel': video_data.get('channelName'),