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-parser/fuzz/fuzz_targets/parse.rs

@@ -0,0 +1,13 @@
+#![no_main]
+
+use libfuzzer_sys::fuzz_target;
+
+use nu_parser::*;
+use nu_protocol::engine::{EngineState, StateWorkingSet};
+
+fuzz_target!(|data: &[u8]| {
+    let engine_state = EngineState::new();
+    let mut working_set = StateWorkingSet::new(&engine_state);
+
+    let _block = parse(&mut working_set, None, &data, true);
+});