Dataloader auto resolve

[hero101]

Dataloaders now auto-resolves for nullable graphql fields as the default behaviour when resolving the unresolved result for a key.
This is useful when the result is expected to be null, and it's not an exceptional case.

The default behaviour is determined by the Loader decorator on the dataloader`s creation.
If the underlying graphql field, for which the dataloader is created, is nullable - the result can be resolved to null.
Example:

@ResolveField(() => ICallout, {
  nullable: true,
  description: 'The Callout that was published.',
})
public callout(
  @Parent() { payload }: InAppNotificationCalloutPublished,
  @Loader(CalloutLoaderCreator) loader: ILoader<ICallout | null>
) {
  return loader.load(payload.calloutID);
}

The callout is decorated as nullable, so the dataloader will auto-resolve to null if the result is not found.
You can override this behaviour by setting the resolveToNull flag to false. That way the problematic values will always be resolved to errors.

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[hero101]

closing in favor of #4776