Make RetryListener use a generic type on the interface not on method.

[spjoe]

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public interface RetryListener {
    <V> void onRetry(Attempt<V> var1);
}

should be:

public interface RetryListener<V> {
    void onRetry(Attempt<V> var1);
}

with this change, withRetryListener would work much more naturally.

Because this is technically a breaking change also a new interface could be introduced and a new method called like withTypedRetryListener