Enhance CI linting step to include all targets and treat warnings as errors

Author: Shresht7

.github/workflows/ci.yml

@@ -20,7 +20,7 @@ jobs:
         run: cargo fmt --check
 
       - name: Lint
-        run: cargo clippy
+        run: cargo clippy --all-targets -- -D warnings
 
       - name: Check
         run: cargo check