fix: Refactor camera control interfaces and event arguments

Significantly restructure camera control interfaces and event arguments.
Removed obsolete interfaces like `IHasCameras` and `CameraSelectedEventArgs`,
and introduced generic event argument classes for improved type safety.
Added `IHasCamerasWithControls` for better management of camera controls.
Corrected the `IHasCameraMuteWithUnmuteReqeust` interface name.
Reintroduced the `eCameraControlMode` enum to define camera control modes.
These changes enhance the organization, clarity, and functionality of the camera control system.

src/PepperDash.Essentials.Devices.Common/Cameras/Interfaces/IHasCameraOff.cs

@@ -0,0 +1,27 @@
+using PepperDash.Essentials.Core;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace PepperDash.Essentials.Devices.Common.Cameras
+{
+
+
+    /// <summary>
+    /// To be implmented on codecs that can disable their camera(s) to blank the near end video
+    /// </summary>
+    public interface IHasCameraOff : IHasCameraControls
+    {
+        /// <summary>
+        /// Feedback that indicates whether the camera is off
+        /// </summary>
+        BoolFeedback CameraIsOffFeedback { get; }
+
+        /// <summary>
+        /// Turns the camera off, blanking the near end video
+        /// </summary>
+        void CameraOff();
+    }
+}