How about adding the `serde` feature to this Crate?

[ssrlive]

This feature will be very useful for users who have serialization/deserialization needs.

Adding the serde feature is very easy:

1. Add it to the Cargo.toml file

[features]
serde = ["dep:serde", "netlink-packet-route/serde"]
# ...

[dependencies]
serde = { version = "1.0", optional = true, features = ["derive"] }
# ...

2. Add it before the structure that needs to be serialized/deserialized

/// Internet Protocol (IP) version.
#[derive(Debug, Clone, Eq, PartialEq, PartialOrd)]
#[cfg_attr(feature = "serde", derive(serde::Serialize, serde::Deserialize))]
pub enum IpVersion {
    /// IPv4
    V4,
    /// IPv6
    V6,
}

Basically achieved the goal.

[cathay4t]

If that is optional feature, I am OK with it.

[ssrlive]

Please review this PR and publish a new version. Otherwise, subsequent work cannot be carried out.

[cathay4t]

That PR is opened for old repo and only implement serde for DefaultNla.

Meanwhile, I am wondering what's the use case need serialization/deserialization.