Work on implementing sheetable client

pubspec.yaml

@@ -40,6 +40,9 @@ dependencies:
   pdfx: ^2.3.0
   saf: ^1.0.3+4
   permission_handler: ^10.2.0
+  http: ^1.2.2
+  path_provider: ^2.1.5
+  flutter_cache_manager: ^3.4.1
 
 dev_dependencies:
   flutter_test:
@@ -50,7 +53,7 @@ dev_dependencies:
   # activated in the `analysis_options.yaml` file located at the root of your
   # package. See that file for information about deactivating specific lint
   # rules and activating additional ones.
-  flutter_lints: ^2.0.0
+  flutter_lints: ^5.0.0
 
 # For information on the generic Dart part of this file, see the
 # following page: https://dart.dev/tools/pub/pubspec