libcameraservice: Refactor the CameraServiceProxyWrapper into a class.

This is necessary for writing a unit test for camera permissions that
checks behavior when the device policy manager has disabled the camera.
Using the true DevicePolicyManager service would require a test be run
while the device has a work profile - a much simpler method would be to
fake the results from CameraServiceProxyWrapper::isCameraDisabled with
an override.

The CameraServiceProxyWrapper is now managed by a shared_ptr that
originates in CameraService, unless this is overridden by an outside
source (cameraservice_test). As a consequence of this, some refactoring
has been done to CameraSessionStatsWrapper class to avoid circular
ownership between it and its parent (CameraServiceProxyWrapper).

Change-Id: Iad4ee87f5c5ab849eee65b72f46f77faf37f4d25
Test: CtsCameraTestCases
diff --git a/services/camera/libcameraservice/api2/CameraDeviceClient.h b/services/camera/libcameraservice/api2/CameraDeviceClient.h
index 45915ba..06844c6 100644
--- a/services/camera/libcameraservice/api2/CameraDeviceClient.h
+++ b/services/camera/libcameraservice/api2/CameraDeviceClient.h
@@ -29,6 +29,7 @@
 #include "common/FrameProcessorBase.h"
 #include "common/Camera2ClientBase.h"
 #include "CompositeStream.h"
+#include "utils/CameraServiceProxyWrapper.h"
 #include "utils/SessionConfigurationUtils.h"
 
 using android::camera3::OutputStreamInfo;
@@ -178,6 +179,7 @@
 
     CameraDeviceClient(const sp<CameraService>& cameraService,
             const sp<hardware::camera2::ICameraDeviceCallbacks>& remoteCallback,
+            std::shared_ptr<CameraServiceProxyWrapper> cameraServiceProxyWrapper,
             const String16& clientPackageName,
             bool clientPackageOverride,
             const std::optional<String16>& clientFeatureId,