ConstructorTypeMacro constructor Null safety

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

ConstructorTypeMacro class

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