Add type annotations to fix lint issues.

Author: James Foster

extras/log_file_client/lib/components/advanced_options_dropdown.dart

@@ -50,7 +50,7 @@ class AdvancedOptionsDropdown extends StatelessWidget {
     );
   }
 
-  Widget _popoverBuilder(context) => Padding(
+  Widget _popoverBuilder(BuildContext context) => Padding(
         padding: const EdgeInsets.all(12),
         child: Column(
           mainAxisSize: MainAxisSize.min,

extras/log_file_client/lib/components/tank_thumbnail.dart

@@ -38,7 +38,7 @@ class TankThumbnail extends StatelessWidget {
     }
   }
 
-  Widget _graph(series, String axis) {
+  Widget _graph(List<CartesianSeries<dynamic, dynamic>> series, String axis) {
     final double setpoint =
         axis == 'pHAxis' ? snapshot.pHSetpoint! : snapshot.temperatureSetpoint!;
     final double deviation = axis == 'pHAxis' ? pHDeviation : tempDeviation;

extras/log_file_client/lib/pages/home_page.dart

@@ -153,7 +153,7 @@ class _HomePageState extends State<HomePage> {
     );
   }
 
-  EdgeInsets _gridViewPadding(sideMargins) {
+  EdgeInsets _gridViewPadding(double sideMargins) {
     return EdgeInsets.only(
       left: sideMargins,
       right: sideMargins,