rename palette.dart to material_chart_colors.dart

Makes the purpose of the file clearer.

PiperOrigin-RevId: 259544046

Author: har79

angular_components/lib/scorecard/scoreboard.dart

@@ -11,7 +11,7 @@ import 'package:angular_components/material_button/material_button.dart';
 import 'package:angular_components/material_icon/material_icon.dart';
 import 'package:angular_components/model/selection/selection_model.dart';
 import 'package:angular_components/utils/browser/dom_service/angular_2.dart';
-import 'package:angular_components/utils/color/palette.dart';
+import 'package:angular_components/utils/color/material_chart_colors.dart';
 import 'package:angular_components/utils/disposer/disposer.dart';
 
 import 'scorecard.dart';

angular_components/lib/scorecard/scorecard.dart

@@ -12,7 +12,7 @@ import 'package:angular_components/material_ripple/material_ripple.dart';
 import 'package:angular_components/utils/browser/dom_service/dom_service.dart';
 import 'package:angular_components/utils/browser/events/events.dart';
 import 'package:angular_components/utils/color/color.dart';
-import 'package:angular_components/utils/color/palette.dart';
+import 'package:angular_components/utils/color/material_chart_colors.dart';
 
 /// Standalone scorecard component.
 ///