Reconsider Mutex and RwLock implementations

[RustomMS]

Consider returning to the std::sync::{Mutex, RwLock} implementations in conrast to our current use of parking_lot

Rust 1.62.0 uses futexes directly (parking_lot uses futexes on linux too in addition to a userspace hash table)
https://blog.rust-lang.org/2022/06/30/Rust-1.62.0.html#thinner-faster-mutexes-on-linux
rust-lang/rust#95035 (comment)
https://github.com/matklad/lock-bench

This may require bench marking and other research