Expose camera input channels to the UI and ensure the cached values are refreshed when updated (#3607)

* expose camera input channels to the ui and ensure the cached values are refreshed when updated

Signed-off-by: hultonha <hultonha@amazon.co.uk>

* small fixes for tests

Signed-off-by: hultonha <hultonha@amazon.co.uk>

Code/Editor/EditorViewportWidget.h

@@ -19,6 +19,7 @@
 #include "Undo/Undo.h"
 #include "Util/PredefinedAspectRatios.h"
 #include "EditorViewportSettings.h"
+#include "EditorModularViewportCameraComposer.h"
 
 #include <AzCore/Component/EntityId.h>
 #include <AzCore/std/optional.h>
@@ -369,6 +370,8 @@ private:
     // This widget holds a reference to the manipulator manage because its responsible for drawing manipulators
     AZStd::shared_ptr<AzToolsFramework::ManipulatorManager> m_manipulatorManager;
 
+    AZStd::unique_ptr<SandboxEditor::EditorModularViewportCameraComposer> m_editorModularViewportCameraComposer;
+
     // Helper for getting EditorEntityNotificationBus events
     AZStd::unique_ptr<AZ::ViewportHelpers::EditorEntityNotifications> m_editorEntityNotifications;
 
@@ -389,7 +392,3 @@ private:
 
     AZ_POP_DISABLE_DLL_EXPORT_MEMBER_WARNING
 };
-
-//! Creates a modular camera controller in the configuration used by the editor viewport.
-SANDBOX_API AZStd::shared_ptr<AtomToolsFramework::ModularViewportCameraController> CreateModularViewportCameraController(
-    const AzFramework::ViewportId viewportId);