add clippy

Author: CppCXY

crates/emmylua_code_analysis/src/lib.rs

@@ -1,3 +1,10 @@
+#![deny(
+    clippy::unwrap_used,
+    clippy::unwrap_in_result,
+    clippy::panic,
+    clippy::panic_in_result_fn
+)]
+
 mod compilation;
 mod config;
 mod db_index;