Rollup merge of #100337 - camelid:stabilize-io_read_to_string, r=JohnTitor

Stabilize `std::io::read_to_string`

Closes #80218. :tada:

This PR stabilizes the `std::io::read_to_string` function, with the following public API:

```rust
pub fn read_to_string<R: Read>(reader: R) -> Result<String>;
```

It's analogous to `std::fs::read_to_string` for files, but it works on anything that implements `io::Read`, including `io::stdin()`.

See the tracking issue (#80218) or documentation for details.

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