ConstructorDeclarationMacro constructor Null safety

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

ConstructorDeclarationMacro class

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