add barcode scan

pubspec.lock

@@ -28,7 +28,7 @@ packages:
       name: barcode_scan
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "3.0.1"
+    version: "2.0.2"
   boolean_selector:
     dependency: transitive
     description:
@@ -295,13 +295,6 @@ packages:
       url: "https://pub.dartlang.org"
     source: hosted
     version: "3.1.6"
-  fixnum:
-    dependency: transitive
-    description:
-      name: fixnum
-      url: "https://pub.dartlang.org"
-    source: hosted
-    version: "0.10.11"
   flutter:
     dependency: "direct main"
     description: flutter
@@ -681,13 +674,6 @@ packages:
       relative: true
     source: path
     version: "0.0.1"
-  protobuf:
-    dependency: transitive
-    description:
-      name: protobuf
-      url: "https://pub.dartlang.org"
-    source: hosted
-    version: "1.0.1"
   provider:
     dependency: "direct main"
     description: