Hetzner cloud resource using hcloud-go. Requires polling via Meta:poll param. This first commit provides a stable vm resource with support for the basic functions of creating, deleting and updating a live server instance. SSH key handling does still require some attention to make sure checkapply can detect and update live changes to the specified keylist. A dedicated hetzner:sshkeys resource might be in order to make sure the keyset is handled correctly if there are multiple hetzner:vm resources running under the same Hetzner project. All remarks for future improvements are indicated with a TODO prefix
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