Start moving RGB MOD from Notification to RGB MOD service.

applications/services/rgb_backlight/application.fam

@@ -0,0 +1,11 @@
+App(
+    appid="rgb_backlight",
+    name="RgbBackLightSrv",
+    apptype=FlipperAppType.SERVICE,
+    entry_point="rgb_backlight_srv",
+    cdefines=["SRV_RGB_BACKLIGHT"],
+    stack_size=1 * 1024,
+    order=99,
+    sdk_headers=["rgb_backlight.h"],
+    provides=["rgb_backlight_settings"],
+)