Rollup merge of #52821 - fukatani:gdb-vecdeque-print, r=michaelwoerister

pretty print for std::collections::vecdeque

I want pretty print function for VecDeque like Vec.

```rust
use std::collections::VecDeque;

fn main() {
    let mut d: VecDeque<i32> = VecDeque::new();
    d.push_back(4);
    d.push_back(4);
    d.push_back(6);
    let mut v: Vec<i32> = Vec::new();
    v.push(4);
    v.push(4);
    v.push(6);
}
```

```
(gdb) p v
$1 = Vec<i32>(len: 3, cap: 4) = {4, 4, 6}
(gdb) p d
$2 = VecDeque<i32>(len: 3, cap: 8) = {4, 4, 6}
```

Thanks.

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