Refactor: Add Javadoc comments to meet Checkstyle build requirements (#1269)

Signed-off-by: Harsh Mehta <[email protected]>

Author: HarshMehta112

src/main/java/org/opensearch/flowframework/model/Config.java

@@ -106,20 +106,23 @@ public static Config parse(XContentParser parser) throws IOException {
     }
 
     /**
+     * Gets the master key used for encryption.
      * @return the masterKey
      */
     public String masterKey() {
         return masterKey;
     }
 
     /**
+     * Gets the creation time of the config.
      * @return the createTime
      */
     public Instant createTime() {
         return createTime;
     }
 
     /**
+     * Gets the tenant ID associated with the config.
      * @return the tenantId
      */
     public Object tenantId() {