OwnedMemberName etc. can not be deserialized from a reader, likely not from a string either due to the 'static lifetime

When working at #285 (closed), I came across something which likely is a lifetime issue. The &'static str for a, lets say, OwnedMemberName, can not be created from a dynamic string or a file, so the deserialization fails at runtime. I honestly don't know what solution you'd prefer. The MemberName is elegant in a way, and addition of the owned variants as well. Of course, i can continue the mentioned issue without this particular change, or we can change the internals of the zbus_names types as well.