Rollup merge of #93759 - dtolnay:usetree, r=nagisa
Pretty print ItemKind::Use in rustfmt style
This PR backports the formatting for `use` items from https://github.com/dtolnay/prettyplease into rustc_ast_pretty.
Before:
```rust
use core::{cmp::{Eq, Ord, PartialEq, PartialOrd},
convert::{AsMut, AsRef, From, Into},
iter::{DoubleEndedIterator, ExactSizeIterator, Extend, FromIterator,
IntoIterator, Iterator},
marker::{Copy as Copy, Send as Send, Sized as Sized, Sync as Sync, Unpin
as U}, ops::{*, Drop, Fn, FnMut, FnOnce}};
```
After:
```rust
use core::{
cmp::{Eq, Ord, PartialEq, PartialOrd},
convert::{AsMut, AsRef, From, Into},
iter::{
DoubleEndedIterator, ExactSizeIterator, Extend, FromIterator,
IntoIterator, Iterator,
},
marker::{
Copy as Copy, Send as Send, Sized as Sized, Sync as Sync, Unpin as U,
},
ops::{*, Drop, Fn, FnMut, FnOnce},
};
```
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