Implement FromStr for PathBuf

This makes PathBuf compatible with std version as you can simply call
let path: PathBuf = FromStr::from_str(s).unwrap()

src/path/pathbuf.rs

@@ -1,6 +1,7 @@
 use std::ffi::{OsStr, OsString};
 #[cfg(feature = "unstable")]
 use std::pin::Pin;
+use std::str::FromStr;
 
 use crate::path::Path;
 #[cfg(feature = "unstable")]
@@ -228,6 +229,14 @@ impl From<&str> for PathBuf {
     }
 }
 
+impl FromStr for PathBuf {
+    type Err = core::convert::Infallible;
+
+    fn from_str(s: &str) -> Result<Self, Self::Err> {
+        Ok(std::path::PathBuf::from(s).into())
+    }
+}
+
 impl AsRef<Path> for PathBuf {
     fn as_ref(&self) -> &Path {
         Path::new(&self.inner)