refactor(dart/transform): Remove unnecessary getter/setter codegen

Currently the transformer generates all getters and setters even when
creating pre-generated change detectors, which remove the need for them.

Generate getters and setters via the model provided by `ProtoViewDto`,
which contains enough information to allow omitting unnecessary getters
and setters from code output.

Allow generating getters, setters, and method names which are Dart
pseudo keywords.

Closes #3489

modules/angular2/test/transform/integration/two_annotations_files/expected/bar.ng_deps.dart

@@ -19,8 +19,7 @@ void initReflector() {
           const Component(selector: '[soup]'),
           const View(template: 'Salad: {{myNum}} is awesome')
         ], const [], () => new MyComponent()))
-    ..registerGetters({'myNum': (o) => o.myNum})
-    ..registerSetters({'myNum': (o, v) => o.myNum = v});
+    ..registerGetters({'myNum': (o) => o.myNum});
   _gen.preGeneratedProtoDetectors['MyComponent_comp_0'] =
       _MyComponent_ChangeDetector0.newProtoChangeDetector;
 }