feat: find some different mechanism for generic router ports

[dadada]

To forward each "port" which can be any "network interface" implementation, hypervisor port and so on, trait objects are used (see RouterInput, `RouterOutput). This is kind of analogous to virtual function calls, which are not easily certified. A limited polymorphism for the possible port types would maybe be more applicable. But since the implementation for a "network interface" can come from another crate, defining a complete enum is difficult. Maybe we can use limited compile-time polymorphism to construct an enum for this? Is it possible to use a type in a653rs-router that is only known at compile-time at the use-site?

[dadada]

Would need to merge the platform-specific crates into one and use features