modules: Create net module

[ramon-bernardo]

Add a net module, initially with SocketAddr and IpAddr types and their respective methods. TCP and UDP will be implemented in the future.

[udoprog]

Cheers. So we're missing rune doctests, and the module has to be installed to be available. See where the module function is used for other modules.

[ramon-bernardo]

@udoprog how do I implement generating an IpAddr from a string, int, array of ints, etc., similar to the std IpAddr?

("127.0.0.1".parse())
(127, 0, 0, 1)
[127, 0, 0, 1]

[udoprog]

how do I implement generating an IpAddr from a string, int, array of ints, etc., similar to the std IpAddr?

You add the relevant methods to perform the conversion. Like the parse associated method, possible through a trait.

[ramon-bernardo]

We need a way to create an IpAddr. What is a preference: enum or constructors?

The std is IpAddr::V4(...) or V6(...)

[udoprog]

The target is "Whatever Rust does" unless there is a good reason to deviate. So an Enum seems like the answer right now.

Make sure to add doc tests which exercises the constructors and pattern matching over the various variants to make sure they are installed!