ConstructorDefinitionBuilder constructor Null safety

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

ConstructorDefinitionBuilder class

1. Constructors
2. ConstructorDefinitionBuilder
3. Properties
4. hashCode
5. runtimeType
6. Methods
7. implement
8. noSuchMethod
9. toString
10. typeDefinitionOf
11. wrapBody
12. Operators
13. operator ==