Implemented EXIF store and display (#19)

* Added EXIF extracting in the backend
* Added EXIF displaying on `image_viewer_page.dart`
* Added Icon for backup option not enable

mobile/pubspec.lock

@@ -50,6 +50,13 @@ packages:
       url: "https://pub.dartlang.org"
     source: hosted
     version: "3.2.1"
+  badges:
+    dependency: "direct main"
+    description:
+      name: badges
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "2.0.2"
   boolean_selector:
     dependency: transitive
     description:
@@ -513,13 +520,6 @@ packages:
       url: "https://pub.dartlang.org"
     source: hosted
     version: "0.12.11"
-  material_color_utilities:
-    dependency: transitive
-    description:
-      name: material_color_utilities
-      url: "https://pub.dartlang.org"
-    source: hosted
-    version: "0.1.3"
   meta:
     dependency: transitive
     description:
@@ -639,6 +639,13 @@ packages:
       url: "https://pub.dartlang.org"
     source: hosted
     version: "1.3.10"
+  photo_view:
+    dependency: "direct main"
+    description:
+      name: photo_view
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "0.13.0"
   platform:
     dependency: transitive
     description:
@@ -825,7 +832,7 @@ packages:
       name: test_api
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "0.4.8"
+    version: "0.4.3"
   timing:
     dependency: transitive
     description: