chore: 🤖 make parking_lot dependency optional

[IWANABETHATGUY]

Summary

parking_lot is not always the best choice after rust stable 1.62 https://blog.rust-lang.org/2022/06/30/Rust-1.62.0.html#thinner-faster-mutexes-on-linux

1. Make parking_lot an optional dependency
2. Adding a new feature parking_lot_support to let user enable the optional dependency parking_lot
3. Adding the feature parking_lot_support to the default_features list to avoid breaking changes.

[IWANABETHATGUY]

Here is the benchmark for current std::sync::Mutex rust-lang/rust#95035 (comment), It is 10 times faster than parking_lot::Mutex when the extreme contention scenario, although not all platforms have been migrated to Mutex with futex based ones (e.g. MacOs ), more details you could refer to rust-lang/rust#93740

[bors-servo]

☔ The latest upstream changes (presumably #268) made this pull request unmergeable. Please resolve the merge conflicts.