[gimy] Add new extractor

[Isaac-the-Man]

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• Searched the bugtracker for similar pull requests
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• Read youtube-dl coding conventions and adjusted the code to meet them
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What is the purpose of your pull request?

• Bug fix
• Improvement
• New extractor
• New feature

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Description of your pull request and other information

Added a new extractor to support the site gimy.co

[wei-juncheng]

Hi @Isaac-the-Man
Thank you for your contribution. However, it seems that a considerable amount of time has passed, and the URL gimy.co has been removed. Do you plan to support new URLs for gimy, such as gimy.ai, gimy.cc, etc.?

[dirkf]

Please open a site support issue for these gimy URLs (which was never done before and may have contributed to the neglect of this PR). Then we'll see if this is an acceptable site for yt-dl and to what extent this PR code can be adapted to support the current site.

[Isaac-the-Man]

Unfortunately, it seems like both sites are pirating streaming services. I'll be happy to help if it ever becomes legal.