Implement TemplateStatefulSet function

[lllamnyp]

This PR implements the factory.TemplateStatefulSet function. The templating was originally carried out as part of the factory.CreateOrUpdateStatefulSet function. Almost all of the templating is branchless and is mostly inlined inside of a struct literal. References to the PodTemplate field of the EtcdCluster.Spec struct were dropped, as premature features that for now only complicate the code, while being non-essential to operating an etcd cluster. When needed, parts of the statefulset template can be factored back out into separate helper functions, much like is already done in e.g. factory.volumes() and the possibility of customizing the etcd pod with custom annotations, labels, sidecar containers, etc. can be restored.

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