Use RTCIceCandidate instead of str for candidate

[edenhaus]

Breaking change

Changing the type of the candidate from str to RTCIceCandidate on:

• class Camera -> method async_on_webrtc_candidate
• class CameraWebRTCProvider -> method async_on_webrtc_candidate
• class WebRTCCandidate

Proposed change

Changing the type of the candidate from str to RTCIceCandidate on:

• class Camera -> method async_on_webrtc_candidate
• class CameraWebRTCProvider -> method async_on_webrtc_candidate
• class WebRTCCandidate

It was discussed internally that this PR should be cherry-picked into the beta to avoid a breaking change in the future, as the changed methods are not part of any stable release yet.
Frontend and WS changes will be in a follow-up PR, as they don't need to be cherry-picked.

Type of change

• Dependency upgrade
• Bugfix (non-breaking change which fixes an issue)
• New integration (thank you!)
• New feature (which adds functionality to an existing integration)
• Deprecation (breaking change to happen in the future)
• Breaking change (fix/feature causing existing functionality to break)
• Code quality improvements to existing code or addition of tests

Additional information

• This PR fixes or closes issue: fixes #
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[home-assistant]

Hey there @home-assistant/core, mind taking a look at this pull request as it has been labeled with an integration (camera) you are listed as a code owner for? Thanks!

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[home-assistant]

Hey there @home-assistant/core, mind taking a look at this pull request as it has been labeled with an integration (go2rtc) you are listed as a code owner for? Thanks!

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[edenhaus]

This method will removed in a follow-up, where also the frontend will migrate to RTCIceCandidate