Rollup merge of #60458 - KodrAus:debug_map_entry, r=alexcrichton

Add key and value methods to DebugMap

Implementation PR for an active (not approved) RFC: https://github.com/rust-lang/rfcs/pull/2696.

Add two new methods to `std::fmt::DebugMap` for writing the key and value part of a map entry separately:

```rust
impl<'a, 'b: 'a> DebugMap<'a, 'b> {
    pub fn key(&mut self, key: &dyn Debug) -> &mut Self;
    pub fn value(&mut self, value: &dyn Debug) -> &mut Self;
}
```

I want to do this so that I can write a `serde::Serializer` that forwards to our format builders, so that any `T: Serialize` can also be treated like a `T: Debug`.

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