Implement various `Reflect` traits on `std` library types

[ActuallyHappening]

Thanks so much for bevy! Its an awesome crate and ecosystem that is awesome to program with :)

What problem does this solve or what need does it fill?

I am wanting to #[derive(Reflect)] on structs / enums with std library types, like IpAddr, in the same way I can derive them for primitive types like u16 and bool.

What solution would you like?

This code to just compile:

#[derive(bevy::prelude::Reflect)]
struct Foo {
    bar: std::net::IpAddr,
    bax: std::time::Duration,
}

So that I can do awesome things like: app.register_type::<Foo>()

What alternative(s) have you considered?

I know no other way of actually being able to reflect these values, nor if it is even possible given that the fields are private. I do not want to resort to manually implementing TypePath, Reflect and FromReflect for wrapper types and using those everywhere, since my lack of knowledge in this area is too big a blocker to spend a few days experimenting.

Additional context

This would allow me to edit std library types using bevy_editor_pls

[soqb]

no blockers here as i see. i think a PR reflecting most std types (especially with reflect_value) would be unambiguously approved - it's just churn. unfortunately considering there are a lot of types in std it's unlikely we'll get around to many without a dedicated PR or an issue focused to a narrower set of types.