[Soundcloud] Download Soundcloud GO+ high quality streams

[unkernet]

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• [X] Searched the bugtracker for similar pull requests
• [X] Read adding new extractor tutorial
• [X] Read youtube-dl coding conventions and adjusted the code to meet them
• [X] Covered the code with tests (note that PRs without tests will be REJECTED)
• [X] Checked the code with flake8

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What is the purpose of your pull request?

• [ ] Bug fix
• [X] Improvement
• [ ] New extractor
• [ ] New feature

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Description of your pull request and other information

Added ability to download high quality 256k AAC streams with a Soundcloud GO+ account using cookies This is not the same as a #26265

python3 -m youtube_dl -F --cookies soundcloud.com_cookies.txt https://soundcloud.com/g-e-j-u/bm-geju-fractoids-garden-220831
[soundcloud] g-e-j-u/bm-geju-fractoids-garden-220831: Downloading webpage
[soundcloud] 1371317128: Downloading JSON metadata
[soundcloud] 1371317128: Downloading JSON metadata
[soundcloud] 1371317128: Downloading JSON metadata
[soundcloud] 1371317128: Downloading JSON metadata
[soundcloud] 1371317128: Downloading JSON metadata
[info] Available formats for 1371317128:
format code   extension  resolution note
hls_opus_64   opus       audio only audio@ 64k
hls_mp3_128   mp3        audio only audio@128k
hls_aac_256   aac        audio only audio@256k
http_mp3_128  mp3        audio only audio@128k
http_aac_256  aac        audio only audio@256k (best)