[FEATURE REQ] Support IRC announces with optional lines

[Kuredant]

It would be nice to be able to handle IRC announces that have a variable number of lines (e.g. a main announce and an optional freeleech line).
For example, with SugoiMusic, we might have the following announces:

[TV Music] TV Show – Title [TS / MPEG-2 / 1440x1080 / AAC / Japanese / NoSubs] - https://sugoimusic.me/torrents.php?id=000010 / https://sugoimusic.me/torrents.php?action=download&id=000011 - japanese,live Uploaded by: Uploader
FREELEECH - https://sugoimusic.me/torrents.php?id=000010 / https://sugoimusic.me/torrents.php?action=download&id=000011
[Single] Artist – Album Name [FLAC] - https://sugoimusic.me/torrents.php?id=000020 / https://sugoimusic.me/torrents.php?action=download&id=000021 - japanese,pop,female.vocalist Uploaded by: Uploader

The first two lines are for a freeleech torrent, the third is for a non-freeleech torrent.
The second line is optional and only used for freeleech content.

Ideally, we'd be able to do something like this in sugoimusic.yaml:

 parse:
    type: multi
    lines:
      - test:
          - "[Album] Artist – Album Name [FLAC / 2017 / catnumber] - https://sugoimusic.me/torrents.php?id=000010 / https://sugoimusic.me/torrents.php?action=download&id=000011 - japanese,pop,female.vocalist Uploaded by: Uploader 1"
          - "[Single] Artist – Album Name [MP3] - https://sugoimusic.me/torrents.php?id=000020 / https://sugoimusic.me/torrents.php?action=download&id=000021 - japanese,pop,dance Uploaded by: Uploader 2"
          - "[Album] Artist – Album Name [FLAC / 2023 / (+2) / catnumber] - https://sugoimusic.me/torrents.php?id=000030 / https://sugoimusic.me/torrents.php?action=download&id=000031 - japanese Uploaded by: Uploader 3"
          - "[TV Music] TV Show – Title [TS / MPEG-2 / 1920x1080 / AAC / Japanese / NoSubs] - https://sugoimusic.me/torrents.php?id=000040 / https://sugoimusic.me/torrents.php?action=download&id=000041 - japanese,live Uploaded by: Uploader 4"
        pattern: '(\[(.*)\] .*? – .+? \[((?:[^/]+)?(?:(?: \/ )(\d{4}))?(?: \/ [^/]+)*)\]) - (https?://.+/).+id=(\d+) \/ https?://.+action=download&id=(\d+) - (.*) Uploaded by: (.*)'
        vars:
          - torrentName
          - category
          - releaseTags
          - year
          - baseUrl
          - groupId
          - torrentId
          - tags
          - uploader
      - test:
          - "FREELEECH - https://sugoimusic.me/torrents.php?id=000010 / https://sugoimusic.me/torrents.php?action=download&id=000011"
        pattern: '(FREELEECH)?.*'
        optional: true
        vars:
          - freeleech

Currently, using multi here would expect two lines every time and miss some announces.

Related: #1255