libcamera: Add debug control space

Add a new 'debug' controls namespace for the upcoming implementation of
debug metadata. While at it, sort the entries alphabetically.

Signed-off-by: Stefan Klug <stefan.klug@ideasonboard.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Kieran Bingham <kieran.bingham@ideasonboard.com>

src/libcamera/control_ids_debug.yaml

@@ -0,0 +1,6 @@
+# SPDX-License-Identifier: LGPL-2.1-or-later
+#
+%YAML 1.1
+---
+vendor: debug
+controls: []

src/libcamera/control_ranges.yaml

@@ -13,6 +13,8 @@ ranges:
   draft: 10000
   # Raspberry Pi vendor controls
   rpi: 20000
-  # Next range starts at 30000
+  # Controls for debug metadata
+  debug: 30000
+  # Next range starts at 40000
 
 ...