DefinitionBuilder constructor Null safety

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

DefinitionBuilder class

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