Add paramether of config to handle if need to process parse to json or not

rule-engine/rule-engine-components/src/main/java/org/thingsboard/rule/engine/rest/TbHttpClient.java

@@ -247,7 +247,7 @@ public class TbHttpClient {
     }
 
     protected String parseJsonStringToPlainText(String data, boolean parseToJson) {
-        if (data.startsWith("\"") && data.endsWith("\"") && data.length() >= 2) {
+        if (parseToJson && data.startsWith("\"") && data.endsWith("\"") && data.length() >= 2) {
             final String dataBefore = data;
             try {
                 data = JacksonUtil.fromString(data, String.class);