CameraServiceProxy: Add client API level to log metrics

The camera client API level needs to be part of the log
metrics.

Bug: 68653614
Test: Manual using application
Change-Id: I5dd250e956e9509228b04ca45cf9ab14a2e87c21
diff --git a/proto/src/metrics_constants.proto b/proto/src/metrics_constants.proto
index c56002e..f87dbb5 100644
--- a/proto/src/metrics_constants.proto
+++ b/proto/src/metrics_constants.proto
@@ -5328,6 +5328,11 @@
     // OS: P
     PACKAGE_OPTIMIZATION_COMPILATION_REASON = 1321;
 
+    // FIELD: The camera API level used.
+    // CATEGORY: CAMERA
+    // OS: P
+    FIELD_CAMERA_API_LEVEL = 1322;
+
     // ---- End P Constants, all P constants go above this line ----
     // Add new aosp constants above this line.
     // END OF AOSP CONSTANTS