Set up cove-macro proc macro crate

cove-macro/Cargo.toml

@@ -0,0 +1,12 @@
+[package]
+name = "cove-macro"
+version = { workspace = true }
+edition = { workspace = true }
+
+[dependencies]
+proc-macro2 = "1.0.56"
+quote = "1.0.26"
+syn = "2.0.15"
+
+[lib]
+proc-macro = true

cove-macro/src/lib.rs

@@ -0,0 +1,10 @@
+#![forbid(unsafe_code)]
+// Rustc lint groups
+#![warn(future_incompatible)]
+#![warn(rust_2018_idioms)]
+#![warn(unused)]
+// Rustc lints
+#![warn(noop_method_call)]
+#![warn(single_use_lifetimes)]
+// Clippy lints
+#![warn(clippy::use_self)]