Depedency Injection: Diagnostic for Circular `@Inject` Dependencies

[KidoVin01]

Circular Dependencies

Detecting and resolving circular dependencies is left as an exercise for the injector implementation. Circular dependencies between two constructors is an obvious problem, but you can also have a circular dependency between injectable fields or methods:

   class A {
     @Inject B b;
   }
   class B {
     @Inject A a;
   }

Diagnostics

• Identify @Inject field/method/constructor
• If dependency class contains @Inject field/method/constructor, navigate through the recursive dependency class
• If a circular dependency is detected, deliver diagnostic errors at each dependency class that a circular dependency is detected

Note 1: The injected dependencies must be matching Note 2: The diagnostics and error identification depends on #159 for reading class information across files.

Related to #153

[kathrynkodama]

See #159, will we encounter the same problem here where we may not have knowledge of both Class A and Class B?

[KidoVin01]

Will now depend on #159