Remove unused code and imports

Author: hsul4n

floor_generator/lib/processor/queryable_processor.dart

@@ -1,6 +1,5 @@
 import 'package:analyzer/dart/element/element.dart';
 import 'package:analyzer/dart/element/type.dart';
-import 'package:build/build.dart';
 import 'package:floor_annotation/floor_annotation.dart' as annotations;
 import 'package:floor_generator/misc/annotations.dart';
 import 'package:floor_generator/misc/type_utils.dart';

floor_generator/test/value_object/entity_test.dart

@@ -30,11 +30,6 @@ void main() {
   );
   final allFields = [field, nullableField];
 
-  final embedded = Embedded(
-    mockFieldElement,
-    [field],
-  );
-
   tearDown(() {
     clearInteractions(mockClassElement);
     clearInteractions(mockFieldElement);