Auto merge of #100869 - nnethercote:replace-ThinVec, r=spastorino

Replace `rustc_data_structures::thin_vec::ThinVec` with `thin_vec::ThinVec`

`rustc_data_structures::thin_vec::ThinVec` looks like this:
```
pub struct ThinVec<T>(Option<Box<Vec<T>>>);
```
It's just a zero word if the vector is empty, but requires two
allocations if it is non-empty. So it's only usable in cases where the
vector is empty most of the time.

This commit removes it in favour of `thin_vec::ThinVec`, which is also
word-sized, but stores the length and capacity in the same allocation as
the elements. It's good in a wider variety of situation, e.g. in enum
variants where the vector is usually/always non-empty.

The commit also:
- Sorts some `Cargo.toml` dependency lists, to make additions easier.
- Sorts some `use` item lists, to make additions easier.
- Changes `clean_trait_ref_with_bindings` to take a
  `ThinVec<TypeBinding>` rather than a `&[TypeBinding]`, because this
  avoid some unnecessary allocations.

r? `@spastorino`

compiler/rustc_ast/src/tokenstream.rs

@@ -426,7 +426,8 @@ impl TokenStream {
         let attr_annotated = if attrs.is_empty() {
             tokens.create_token_stream()
         } else {
-            let attr_data = AttributesData { attrs: attrs.to_vec().into(), tokens: tokens.clone() };
+            let attr_data =
+                AttributesData { attrs: attrs.iter().cloned().collect(), tokens: tokens.clone() };
             AttrAnnotatedTokenStream::new(vec![(
                 AttrAnnotatedTokenTree::Attributes(attr_data),
                 Spacing::Alone,