Replace `cargo-cranky` (which has served us well) with workspace lints
xtask
Replaces only the cargo_deny.sh script for now. Can be expanded over time to replace the other shell and python scripts, so only Rust is needed to work with the repository. Closes <https://github.com/emilk/egui/issues/2887> Closes <https://github.com/emilk/egui/issues/4373> --------- Co-authored-by: Emil Ernerfeldt <emil.ernerfeldt@gmail.com>