implemented native share intent support for android and ios with chat and folder pickers

ios/Podfile

@@ -34,6 +34,10 @@ target 'Runner' do
   pod 'PhoneNumberKit', '~> 3.7.6'
 
   flutter_install_all_ios_pods File.dirname(File.realpath(__FILE__))
+
+  target 'Share Extension' do
+    inherit! :search_paths
+  end
 #  target 'RunnerTests' do
 #    inherit! :search_paths
 #  end