Add Safari speaker selection support

[fkwp]

With the next iteration of Apple OSes the Speaker Selection API is supported (https://developer.apple.com/documentation/safari-release-notes/safari-26-release-notes#WebRTC)

This PR adds support for it by:

• adding a isSafariSpeakerSelectionSupported helper function
• using that helper function in supportsSetSinkId

fixes #1568 at least for macOS.
In contrast to https://webrtc.github.io/samples/src/content/devices/input-output/ this PR does not (yet) fix the issue on iOS26

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[lukasIO]

Thanks for the PR!

I believe the speaker selection API comes with some more caveats (explicit user permission must be granted for output selection if no microphone is acquired yet).

I haven't tested this, but probably needs its own selection path via MediaDevices.selectAudioOutput ?

[lukasIO]

this check is not connected to checking against Safari, I believe?