ClassDeclarationBuilder constructor Null safety

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

ClassDeclarationBuilder class

1. Constructors
2. ClassDeclarationBuilder
3. Properties
4. hashCode
5. runtimeType
6. Methods
7. addToClass
8. addToLibrary
9. noSuchMethod
10. toString
11. typeDeclarationOf
12. Operators
13. operator ==