Add prePuller.[hook|continuous].daemonsetAnnotations config

[consideRatio]

I understand that annotating the DaemonSet is relevant for use with keel, and then the DaemonSet rather than the individual pods should be configured with annotations as examplified in https://keel.sh/docs/#additional-settings.

This PR provides the prePuller.[hook|continuous].daemonsetAnnotations config options to set annotations on the daemonset resources of the image pullers, as compared to setting them on the image puller pods (hook & continuous) which is already possible via prePuller.annotations.

Fixes #3674
Supercedes / closes #3675

Do you think this meet your needs @paololazzari?

Reasoning about the implementation

Config naming for the image puller mechanism is tricky as we have so multiple resources under the flag "image puller". We got the hook image awaiter Job and Pod, and the hook & continuous image puller DaemonSets and their Pods. Many Helm charts declares podAnnotations etc to clarify that the annotations influences the pod template rather than the owner resource (Deployment, DaemonSet, ...), but we have used just annotations, so I figure it makes sense to name this daemonsetAnnotations. I considered flat vs nested config structure (daemonsetAnnotations vs daemonset.annotations), but I think we should go flat.

[paololazzari]

Looks great, thank you!