Add support for ETTU.tv

[nryc]

DO NOT REMOVE OR SKIP THE ISSUE TEMPLATE

• I understand that I will be blocked if I intentionally remove or skip any mandatory* field

Checklist

• I'm reporting a new site support request
• I've verified that I'm running yt-dlp version 2023.02.17 (update instructions) or later (specify commit)
• I've checked that all provided URLs are playable in a browser with the same IP and same login details
• I've checked that none of provided URLs violate any copyrights or contain any DRM to the best of my knowledge
• I've searched known issues and the bugtracker for similar issues including closed ones. DO NOT post duplicates
• I've read the guidelines for opening an issue
• I've read about sharing account credentials and am willing to share it if required

Region

France

Example URLs

https://www.ettu.tv/en-int/playerpage/1573849

Provide a description that is worded well enough to be understood

Cannot download replays from ettu.tv

Provide verbose output that clearly demonstrates the problem

• Run your yt-dlp command with -vU flag added (yt-dlp -vU <your command line>)
• Copy the WHOLE output (starting with [debug] Command-line config) and insert it below

Complete Verbose Output

[debug] Command-line config: ['-vU', 'https://www.ettu.tv/en-int/playerpage/1573849']
[debug] User config "/home/cuicui/.config/yt-dlp/config": ['--merge-output-format', 'mkv']
[debug] Encodings: locale UTF-8, fs utf-8, pref UTF-8, out utf-8, error utf-8, screen utf-8
[debug] yt-dlp version 2023.02.17 [a0a7c01] (zip)
[debug] Python 3.8.10 (CPython x86_64 64bit) - Linux-5.4.0-139-generic-x86_64-with-glibc2.29 (OpenSSL 1.1.1f  31 Mar 2020, glibc 2.31)
[debug] exe versions: ffmpeg 4.2.7, ffprobe 4.2.7, phantomjs 2.1.1
[debug] Optional libraries: certifi-2022.12.07, pycrypto-3.15.0, pyxattr-0.6.1, secretstorage-2.3.1, sqlite3-2.6.0
[debug] Proxy map: {}
[debug] Loaded 1782 extractors
[debug] Fetching release info: https://api.github.com/repos/yt-dlp/yt-dlp/releases/latest
Latest version: 2023.02.17, Current version: 2023.02.17
yt-dlp is up to date (2023.02.17)
[generic] Extracting URL: https://www.ettu.tv/en-int/playerpage/1573849
[generic] 1573849: Downloading webpage
WARNING: [generic] Falling back on generic information extractor
[generic] 1573849: Extracting information
[debug] Looking for embeds
ERROR: Unsupported URL: https://www.ettu.tv/en-int/playerpage/1573849
Traceback (most recent call last):
  File "/home/cuicui/Sync/bin/yt-dlp/yt_dlp/YoutubeDL.py", line 1502, in wrapper
    return func(self, *args, **kwargs)
  File "/home/cuicui/Sync/bin/yt-dlp/yt_dlp/YoutubeDL.py", line 1578, in __extract_info
    ie_result = ie.extract(url)
  File "/home/cuicui/Sync/bin/yt-dlp/yt_dlp/extractor/common.py", line 693, in extract
    ie_result = self._real_extract(url)
  File "/home/cuicui/Sync/bin/yt-dlp/yt_dlp/extractor/generic.py", line 2509, in _real_extract
    raise UnsupportedError(url)
yt_dlp.utils.UnsupportedError: Unsupported URL: https://www.ettu.tv/en-int/playerpage/1573849