[9News] Add Extractor

[SirElderling]

IMPORTANT: PRs without the template will be CLOSED

Description of your pull request and other information

Initial video extractor for the 9News website.

Fixes #8831

Template

Before submitting a pull request make sure you have:

• At least skimmed through contributing guidelines including yt-dlp coding conventions
• Searched the bugtracker for similar pull requests
• Checked the code with flake8 and ran relevant tests

In order to be accepted and merged into yt-dlp each piece of code must be in public domain or released under Unlicense. Check all of the following options that apply:

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What is the purpose of your pull request?

• Fix or improvement to an extractor (Make sure to add/update tests)
• New extractor (Piracy websites will not be accepted)
• Core bug fix/improvement
• New feature (It is strongly recommended to open an issue first)

[seproDev]

I think you should just be able to use the Brightcove extractor:

return self.url_result(
    f'https://players.brightcove.net/{account}/default_default/index.html?videoId={video_id}',
    BrightcoveNewIE, video_id)

[SirElderling]

I think you should just be able to use the Brightcove extractor:

return self.url_result(
    f'https://players.brightcove.net/{account}/default_default/index.html?videoId={video_id}',
    BrightcoveNewIE, video_id)

Thank you very much for the tip. Adjusted the code to use BrightcoveNewIE as suggested.