feat: defmt + derive for some UDP types

Signed-off-by: Lachezar Lechev <elpiel93@gmail.com>

src/socket.rs

@@ -2,6 +2,8 @@ use crate::bus::Bus;
 use crate::register::socketn;
 use embedded_nal::Ipv4Addr;
 
+#[derive(Debug)]
+#[cfg_attr(feature = "defmt", derive(defmt::Format))]
 pub struct Socket {
     pub index: u8,
     register: u8,