analytics: Make AnalyticsODLocation members public

Get access to AnalyticsODLocation structure members outside
the module is useful if other elements need them.
For example it can be used to draw objects location.

Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer-rs/-/merge_requests/1389>

gstreamer-analytics/src/object_detection.rs

@@ -60,13 +60,13 @@ impl<'a> AnalyticsRelationMetaODExt
     }
 }
 
-#[derive(Default, Debug)]
+#[derive(Clone, Copy, Default, Debug)]
 pub struct AnalyticsODLocation {
-    x: i32,
-    y: i32,
-    w: i32,
-    h: i32,
-    loc_conf_lvl: f32,
+    pub x: i32,
+    pub y: i32,
+    pub w: i32,
+    pub h: i32,
+    pub loc_conf_lvl: f32,
 }
 
 unsafe impl AnalyticsMtd for AnalyticsODMtd {