Add packages

- Add the packages that help the operator work as expected.
- Update `go.mod` by running `go mod tidy`.

pkg/utils/string.go

@@ -0,0 +1,33 @@
+package utils
+
+import (
+	"strconv"
+	"strings"
+)
+
+func ContainsString(slice []string, s string) bool {
+	for _, item := range slice {
+		if item == s {
+			return true
+		}
+	}
+	return false
+}
+
+func RemoveString(slice []string, s string) (result []string) {
+	for _, item := range slice {
+		if item == s {
+			continue
+		}
+		result = append(result, item)
+	}
+	return
+}
+
+func StringToBool(str string) (bool, error) {
+	restartDeploymentBool, err := strconv.ParseBool(strings.ToLower(str))
+	if err != nil {
+		return false, err
+	}
+	return restartDeploymentBool, nil
+}