Provide structured suggestion for `impl Default` of type where all fields have defaults

```
error: `Default` impl doesn't use the declared default field values
  --> $DIR/manual-default-impl-could-be-derived.rs:28:1
   |
LL | / impl Default for B {
LL | |     fn default() -> Self {
LL | |         B {
LL | |             x: s(),
   | |                --- this field has a default value
LL | |             y: 0,
   | |                - this field has a default value
...  |
LL | | }
   | |_^
   |
help: to avoid divergence in behavior between `Struct { .. }` and `<Struct as Default>::default()`, derive the `Default`
   |
LL ~ #[derive(Default)] struct B {
   |
```

Note that above the structured suggestion also includes completely removing the manual `impl`, but the rendering doesn't.

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