signer: _from/_to_dict helpers for Key base fields #558
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Add de/serialization helpers for common fields in the Key base class, which may be used in subclass from/to_dict methods for convenience.
_to_dict: This could be Key.to_dict, which subclasses default to, but we prefer that subclasses must implement a to_dict, to avoid unnoticed serialization errors.
_from_dict: Other than from_dict, this one does not create a Key instance, but just returns the popped off fields. This makes usage in subclasses more flexible and less mystical (lessons learned from theupdateframework/python-tuf@ace25e4).