[Feature]: Support Nullable injection points

Type of feature request

Extension of an existing feature

What kind of feature would you like to see

Currently all injection points are not nullable. This means that every injection point is required to be present.

There are some esoteric, or non-standard use cases where you'd like to support Nullable Injection Points. Meaning that the injection process does not fail if the IOC container cannot find a matching bean instance for the type.

For this feature, all injections points should be able to support @Nullable. If @Nullable is present on any injection point, instead of failing on wiring, it should inject null.

Code Examples

@Wire
public class MyExample {
    @Inject
    @Nullable
    private MyClass myClass;

    public MyExample(@Nullable MyClass myClass) {
    }

    @Inject
    public void inject(@Nullable MyClass myClass) {
    }
}

Feature Design

The annotation processor should provide Identifiable Provider instances, that injects null, if the injection point is not present.. Should look something like this in the IdentifiableProvider:

MyClass parameter0 = wireRepository.tryGet(MyClass.class).orElse(null)

Note: Qualifiers should still work with this.