This commit extends `Volume` and `Network` unit definitions with two
additional parameters, `VolumeName` and `NetworkName`, which will,
respectively, set a user-defined name for the corresponding volume and
network. This is similar to how the `ContainerName` directive currently
works, and should allow for smoother transitions to Quadlet-managed
resources.
Closes: #19003
Signed-off-by: Alex Palaistras <alex@deuill.org>
