Support injecting companion object

[evant]

This generates incorrect code

interface IFoo {
  @Inject
  companion object : IFoo
}

@Component
abstract class MyComponent {
   abstract val foo: IFoo
   val IFoo.Companion.bind: IFoo @Provides get() = this
}

expected:

class InjectMyComponent : MyComponent {
  override val foo: IFoo get() = IFoo.bind
}

actual:

class InjectMyComponent : MyComponent {
  override val foo: IFoo get() = IFoo.Companion().bind
}