Generate Compile Time Proxies for certain @Lazy beans

[SentryMan]

Now will generate proxy classes for true laziness in the following situations with @Lazy beans:

• class with a no-arg constructor
• factory bean method returning a class with a no-arg constructor
• class without a no-arg constructor, but a @BeanTypes class that is an interface or has a no arg constructor
• same as above but with factory bean methods
• factory method, but an interface is the return type

given the following class:

@Lazy
@Singleton
public class LazyBean {

  Provider<Integer> intProvider;

  public LazyBean() {}

  @Inject
  public LazyBean(Provider<Integer> intProvider) {
    this.intProvider = intProvider;
  }

  public LazyBean() {}

  void something() {}
}

the following proxy class is generated:

@Proxy
@Generated("avaje-inject-generator")
public final class LazyBean$Lazy extends LazyBean {

  private final Provider<LazyBean> onceProvider;

  public LazyBean$Lazy(Provider<LazyBean> onceProvider) {
    this.onceProvider = onceProvider;
  }

   void something() {
    onceProvider.get().something();
  }

}

and the DI code is modified like

@Generated("io.avaje.inject.generator")
public final class LazyBean$DI  {

  public static void build(Builder builder) {
    if (builder.isBeanAbsent(LazyBean.class)) {
      builder.registerLazy(() -> {
        var bean = new LazyBean(builder.getProvider(Integer.class));
        return bean;
     }, LazyBean$Lazy::new);
    }
  }

}

resolves #830