chore: checkpoint before Python removal

vendor/tokio/src/fs/read_link.rs

@@ -0,0 +1,12 @@
+use crate::fs::asyncify;
+
+use std::io;
+use std::path::{Path, PathBuf};
+
+/// Reads a symbolic link, returning the file that the link points to.
+///
+/// This is an async version of [`std::fs::read_link`].
+pub async fn read_link(path: impl AsRef<Path>) -> io::Result<PathBuf> {
+    let path = path.as_ref().to_owned();
+    asyncify(move || std::fs::read_link(path)).await
+}