chore: setup clippy

src/lib.rs

@@ -1,3 +1,8 @@
+#![deny(clippy::correctness)]
+// TODO: make all of these errors, such that clippy actually passes.
+#![warn(clippy::all, clippy::perf, clippy::not_unsafe_ptr_arg_deref)]
+// This is nice, but for now just annoying.
+#![allow(clippy::unreadable_literal)]
 #![feature(c_variadic, ptr_wrapping_offset_from, ptr_cast)]
 
 #[macro_use]