ClassTypeMacro constructor Null safety

1. macro_builder
2. definition
3. ClassTypeMacro
4. ClassTypeMacro constructor

ClassTypeMacro class

1. Constructors
2. ClassTypeMacro
3. Properties
4. hashCode
5. runtimeType
6. Methods
7. noSuchMethod
8. toString
9. visitClassType
10. Operators
11. operator ==