[myinstants] Add new extractor

[nuruvilu]

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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

Add support for pulling sound effects from myinstants.com (#28311).

[BradKML]

Thx, also for notes

• Soundboard.com #28313
• 101Soundboards #28312

[upintheairsheep]

Let’s merge this

[BradKML]

@upintheairsheep nice