Migrate to enum instead of str

crates/build/src/crate_metadata.rs

@@ -78,7 +78,7 @@ impl CrateMetadata {
         if let Some(lib_name) = &root_package
             .targets
             .iter()
-            .find(|target| target.kind.iter().any(|f| f.eq(&TargetKind::Lib)))
+            .find(|target| target.kind.iter().any(|f| *f == TargetKind::Lib))
         {
             if lib_name.name != root_package.name {
                 // warn user if they still specify a lib name different from the