[linting_tool] Implement saving rules to DB (#860)

experimental/linting_tool/lib/model/rule.dart

@@ -3,18 +3,27 @@
 // found in the LICENSE file.
 
 import 'package:equatable/equatable.dart';
+import 'package:hive/hive.dart';
 import 'package:json_annotation/json_annotation.dart';
 
 part 'rule.g.dart';
 
 @JsonSerializable()
+@HiveType(typeId: 0)
 class Rule extends Equatable {
+  @HiveField(0)
   final String name;
+  @HiveField(1)
   final String description;
+  @HiveField(2)
   final String group;
+  @HiveField(3)
   final String maturity;
+  @HiveField(4)
   final List<String> incompatible;
+  @HiveField(5)
   final List<String> sets;
+  @HiveField(6)
   final String details;
 
   const Rule({