Add 2 fuzzers for nu-path, nu-parser (#10376)

# Description

This PR adds a fuzzer for the nu-path and the nu-parser crate.
Now you can go to `crates/nu-path/fuzz`/`crates/nu-parser/fuzz` and run `cargo fuzz` to
find crashes.
https://github.com/nushell/nushell/issues/10365 and #9417 was found by
this


---------

Co-authored-by: sholderbach <sholderbach@users.noreply.github.com>

crates/nu-path/fuzz/fuzz_targets/path_fuzzer.rs

@@ -0,0 +1,25 @@
+#![no_main]
+
+use libfuzzer_sys::fuzz_target;
+use nu_path::{expand_path_with, expand_tilde, expand_to_real_path, trim_trailing_slash};
+
+fuzz_target!(|data: &[u8]| {
+    if let Ok(s) = std::str::from_utf8(data) {
+        let path = std::path::Path::new(s);
+
+        // Fuzzing expand_to_real_path function
+        let _ = expand_to_real_path(path);
+
+        // Fuzzing trim_trailing_slash function
+        let _ = trim_trailing_slash(s);
+
+        // Fuzzing expand_tilde function
+        let _ = expand_tilde(path);
+
+        // Fuzzing expand_path_with function
+        // Here, we're assuming a second path for the "relative to" aspect.
+        // For simplicity, we're just using the current directory.
+        let current_dir = std::path::Path::new(".");
+        let _ = expand_path_with(path, &current_dir);
+    }
+});