Replace cargo-cranky with workspace lints (#4413)

Replace `cargo-cranky` (which has served us well) with workspace lints

examples/puffin_profiler/Cargo.toml

@@ -7,6 +7,9 @@ edition = "2021"
 rust-version = "1.76"
 publish = false
 
+[lints]
+workspace = true
+
 
 [features]
 wgpu = ["eframe/wgpu"]

examples/puffin_profiler/src/main.rs

@@ -1,4 +1,5 @@
 #![cfg_attr(not(debug_assertions), windows_subsystem = "windows")] // hide console window on Windows in release
+#![allow(rustdoc::missing_crate_level_docs)] // it's an example
 
 use std::sync::{
     atomic::{AtomicBool, Ordering},