ConstructorDefinitionMacro constructor Null safety

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

ConstructorDefinitionMacro class

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