MethodDeclarationMacro constructor Null safety

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

MethodDeclarationMacro class

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