Rollup merge of #136609 - mammothbane:master, r=scottmcm

libcore/net: `IpAddr::as_octets()`

[ACP](https://github.com/rust-lang/libs-team/issues/535)
[Tracking issue](https://github.com/rust-lang/rust/issues/137259)

Adds `const` `core::net::IpAddr{,v4,v6}::as_octets()` methods to provide reference access to IP address contents.

The concrete usecase for me is allowing the `IpAddr` to provide an extended lifetime in contexts that want a `&[u8]`:

```rust
trait AddrSlice {
    fn addr_slice(&self) -> &[u8];
}

impl AddrSlice for IpAddrV4 {
    fn addr_slice(&self) -> &[u8] {
        // self.octets() doesn't help us here, because we can't return a reference to the owned array.
        // Instead we want the IpAddrV4 to continue owning the memory:
        self.as_octets()
    }
}
```

(Notably, in this case we can't parameterize `AddrSlice` by a `const N: usize` (such that `fn addr_slice(&self) -> [u8; N]`) and maintain object-safety.)

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