Add mac and IP address entries to sys net (#14389)

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# Description
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What it says on the tin, this change adds the `mac` and `ip` columns to
the `sys net` command, where `mac` is the interface mac address and `ip`
is a record containing ipv4 and ipv6 addresses as well as whether or not
the address is loopback and multicast. I thought it might be useful to
have this information available in Nushell. This change basically just
pulls extra information out of the underlying structs in the
`sysinfo::Networks` struct. Here's a screenshot from my system:

![Screenshot from 2024-11-19
11-59-54](https://github.com/user-attachments/assets/92c2d72c-b0d0-49c0-8167-9e1ce853acf1)


# User-Facing Changes
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- Adds `mac` and `ip` columns to the `sys net` command, where `mac`
contains the interface's mac address and `ip` contains information
extracted from the `std::net::IpAddr` struct, including address,
protocol, whether or not the address is loopback, and whether or not
it's multicast

# Tests + Formatting
Didn't add any tests specifically, didn't seem like there were any
relevant tests. Ran existing tests and formatting.

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crates/nu-command/src/system/sys/net.rs

@@ -44,8 +44,29 @@ fn net(span: Span) -> Value {
     let networks = Networks::new_with_refreshed_list()
         .iter()
         .map(|(iface, data)| {
+            let ip_addresses = data
+                .ip_networks()
+                .iter()
+                .map(|ip| {
+                    let protocol = match ip.addr {
+                        std::net::IpAddr::V4(_) => "ipv4",
+                        std::net::IpAddr::V6(_) => "ipv6",
+                    };
+                    Value::record(
+                        record! {
+                            "address" => Value::string(ip.addr.to_string(), span),
+                            "protocol" => Value::string(protocol, span),
+                            "loop" => Value::bool(ip.addr.is_loopback(), span),
+                            "multicast" => Value::bool(ip.addr.is_multicast(), span),
+                        },
+                        span,
+                    )
+                })
+                .collect();
             let record = record! {
                 "name" => Value::string(trim_cstyle_null(iface), span),
+                "mac" => Value::string(data.mac_address().to_string(), span),
+                "ip" => Value::list(ip_addresses, span),
                 "sent" => Value::filesize(data.total_transmitted() as i64, span),
                 "recv" => Value::filesize(data.total_received() as i64, span),
             };