Add Remote Control Feature to Nextcloud Talk

Description:

I would like to suggest the implementation of a remote control feature in Nextcloud Talk, similar to the functionality available in Zoom. This feature would allow a user to request control over another participant's screen during a meeting, facilitating tasks such as technical support, collaborative work, and real-time demonstrations.

Use Case:

Technical Support: Assist users by remotely troubleshooting issues on their devices during a Talk session.
Collaboration: Collaborate more effectively by directly interacting with a colleague's screen to edit documents or configure settings.

Demonstrations: Provide real-time demonstrations by controlling another participant's screen, enhancing training sessions and presentations.

Benefits:

Enhances the versatility of Nextcloud Talk for various professional and educational scenarios.
Improves user experience by reducing the need for external tools to achieve remote control capabilities.
Strengthens Nextcloud Talk's position as a comprehensive communication and collaboration platform.

References:

Zoom's remote control feature allows participants to request or give control over their screen during a meeting, facilitating collaboration and support.
[support.zoom.com](https://support.zoom.com/hc/en/article?id=zm_kb&sysparm_article=KB0065790&utm_source=chatgpt.com)

Implementing this feature would significantly enhance the functionality of Nextcloud Talk and provide users with a more integrated and seamless experience.

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Feature request

Which Nextcloud Version are you currently using: (see administration page)

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Additional context
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Start by reviewing Nextcloud Talk's existing screen-sharing flow and the Zoom remote-control reference linked in the issue. Define how participants request, grant, use, and revoke control, and document the expected behavior for support, collaboration, and demonstrations before identifying the affected implementation areas.