internal/component: Move Pool into lazy package

pkg/errorx/errorx.go

@@ -1,11 +1,8 @@
 package errorx
 
+import "github.com/tkw1536/goprogram/lib/collection"
+
 // First returns the first non-nil error, or nil otherwise.
 func First(errors ...error) error {
-	for _, err := range errors {
-		if err != nil {
-			return err
-		}
-	}
-	return nil
+	return collection.First(errors, func(err error) bool { return err != nil })
 }