Limit concurrent streams option

[c-valentine]

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Feature Request

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I really enjoy Sunshine and been using it ever since but just by accident I noticed that the newer versions have lifted the streams limit previously available. While I understand the beauty of that in multi-viewer streams I personally use Sunshine to locally serve my powerhouse-PC to a multi-client/OS setup in my home like TV, FTV-Sticks, Laptop etc. But neither should my school-age kids interfere if I'm watching 16+ shows, nor should they silently drop in when I'm playing Last of Us.
So my request is to either re-add the option to limit the streams to 1 (or whatever limit wanted) or have the option for an additional PIN check on devices trying to connect to a running stream, even when that machine is generally already whitelisted.

[ReenigneArcher]

Duplicate of https://github.com/orgs/LizardByte/discussions/641