Use default functions instead of driver specific

<?xml version="1.0" encoding="UTF-8"?>
<scenario>
     <name>Use default functions instead of driver specific</name>
     <script>default_functions</script>
     <driver>com.toolsverse.etl.driver.oracle.OracleDriver</driver> 
     
     <sources>
          <source>
               <name>config_property</name>
               <extract>
                    <sql>select * from config_property</sql>
               </extract>
          </source>
          <source>
               <name>config_value</name>
               <extract>
                    <sql>select * from config_value</sql>
               </extract>
          </source>
          <source>
               <name>second_config_value</name>
               <extract>
                    <sql>select * from config_value</sql>
               </extract>
          </source>          
     </sources>
     <destinations>
          <destination>
               <name>config_property</name>
               <metadata>yes</metadata>
               <load>
                   <variables>
                       <CONFIG_PROPERTY_NUM function="getPk" start="100" class="com.toolsverse.etl.core.function.DefFunctions" />
                   </variables>
               </load>
          </destination>
          <destination>
               <name>config_value</name>
               <metadata>yes</metadata>
               <load>
                   <variables>
                       <CONFIG_PROPERTY_NUM function="getFk" class="com.toolsverse.etl.core.function.DefFunctions" />
                   </variables>
               </load>
          </destination>
     </destinations>
</scenario>