nixos/znapzend: stateless setup

This enables znapzend users to specify its full configuration through
NixOS options, without ever needing to use the stateful `znapzendzetup`
command.

This works by running znapzendzetup with the specified config in
ExecPre, just before the znapzend daemon is started.

There is also the `pure` option which will clear all previous znapzend setups,
making it as stateless as can get, as only the setup declared in
configuration.nix will be persisted.

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