[soundgasm] add 'sound' and 'user' extractors

[enduser420]

closes #3384

$ gdl --no-download -v https://www.reddit.com/r/AudioCandy/comments/3z0a47/f_soap_by_melanie_martinez_cover/
[gallery-dl][debug] Version 1.24.2-dev - Git HEAD: bcefbfc5
[gallery-dl][debug] Python 3.10.5 - Windows-10-10.0.19045-SP0
[gallery-dl][debug] requests 2.28.1 - urllib3 1.26.13
[gallery-dl][debug] Configuration Files ['%APPDATA%\\gallery-dl\\config.json']
[gallery-dl][debug] Starting DownloadJob for 'https://www.reddit.com/r/AudioCandy/comments/3z0a47/f_soap_by_melanie_martinez_cover/'
[reddit][debug] Using RedditSubmissionExtractor for 'https://www.reddit.com/r/AudioCandy/comments/3z0a47/f_soap_by_melanie_martinez_cover/'
[urllib3.connectionpool][debug] Starting new HTTPS connection (1): oauth.reddit.com:443
[urllib3.connectionpool][debug] https://oauth.reddit.com:443 "GET /comments/3z0a47/.json?limit=0&raw_json=1 HTTP/1.1" 200 3198
[soundgasm][debug] Using SoundgasmSoundExtractor for 'https://soundgasm.net/u/fierce-aphrodite/Soap-by-Melanie-Martinez-Cover'
[urllib3.connectionpool][debug] Starting new HTTPS connection (1): soundgasm.net:443
[urllib3.connectionpool][debug] https://soundgasm.net:443 "GET /user/fierce-aphrodite/Soap-by-Melanie-Martinez-Cover HTTP/1.1" 200 None
* .\gallery-dl\soundgasm\fierce-aphrodite\Soap by Melanie Martinez (Cover).m4a

[enduser420]

Suggested change

	url = text.extract(page, ': "', '"', page.index('("setMedia",'))[0]
	url = text.extr(page, 'm4a: "', '"')

should i do this?
I don't know if there can be a different ext all the links I came across had m4a in this snippet

$(this).jPlayer("setMedia", {
    m4a: "https://media.soundgasm.net/sounds/04614d5a142ee4d56967ed2b764de3453d048c5b.m4a"
});

[mikf]

Yeah, this would obviously break for any other ext, so I had solved this by extracting all potential formats and just picking the first one.

[mikf]

Sorry about this and thank you. I've already had the code written and committed on Friday (but not pushed) and didn't want to just throw it away.