refactor(pkg): merge pkg/utils into pkg/util

Consolidate pure helper packages under pkg/util and update imports.

pkg/util/value.go

@@ -0,0 +1,16 @@
+package util
+
+import "fmt"
+
+// Interface2String converts a string, int, or float64 value to its string representation.
+func Interface2String(inter interface{}) string {
+	switch v := inter.(type) {
+	case string:
+		return v
+	case int:
+		return fmt.Sprintf("%d", v)
+	case float64:
+		return fmt.Sprintf("%f", v)
+	}
+	return "Not Implemented"
+}