Support for refresh rate and sync interval (#2989)

* Add support for querying the refresh rate and sync interval

Code/Framework/AzFramework/Platform/Linux/AzFramework/Windowing/NativeWindow_Linux.cpp

@@ -23,6 +23,7 @@ namespace AzFramework
                         const WindowGeometry& geometry,
                         const WindowStyleMasks& styleMasks) override;
         NativeWindowHandle GetWindowHandle() const override;
+        uint32_t GetDisplayRefreshRate() const override;
     };
 
     NativeWindow::Implementation* NativeWindow::Implementation::Create()
@@ -44,4 +45,9 @@ namespace AzFramework
         return nullptr;
     }
 
+    uint32_t NativeWindowImpl_Linux::GetDisplayRefreshRate() const
+    {
+        //Using 60 for now until proper support is added
+        return 60;
+    }
 } // namespace AzFramework