[Feature] Detect volume property

[ratoaq2]

+-------------------------------------------------------+
+                   GuessIt 2.0.5                       +
+-------------------------------------------------------+
|      Please report any bug or feature request at      |
|     https://github.com/guessit-io/guessit/issues.     |
+-------------------------------------------------------+

Some file/release names contains the volume information and most of the times it ends up inside the release_group:

guessit 'House.of.Cards.S04E03.Chapter.42.(1080p.x265.10bit.Joy).vol127+128'
For: House.of.Cards.S04E03.Chapter.42.(1080p.x265.10bit.Joy).vol127+128
GuessIt found: {
    "title": "House of Cards", 
    "season": 4, 
    "episode": 3, 
    "episode_title": "Chapter 42", 
    "screen_size": "1080p", 
    "video_codec": "h265", 
    "video_profile": "10bit", 
    "release_group": "Joy).vol127+128", 
    "type": "episode"
}

I'm not aware of the meaning of this volume information. My target was to get a clean release_group name and I faced this issue. My workaround is to post process the release group and remove the pattern \.vol\d+\+\d+

[ratoaq2]

I'm still asking myself if this should be handled by guessit.

These files are not media files and could have the following pattern: Some.Show.720p.HDTV.HEVC.x265-RG.mkv.vol021+17.PAR2.-.08.of.10.Some.Title.Here!.(1/27)

The suffix can bring a lot of issues because of the numbers and / as well. Feel free to reject it.

[Toilal]

I think it makes sense to have a volume property.