Impala Connector with SQL Statement option

Add the Advanced Options section to the Impala Connector (data source) so it can support the use of a SQL Statement rather than only full entities selection through navigation.

This will be very useful as connecting to a Big Data environment through Impala implies a huge amount of data in the entities due the nature of Big Data and pulling full entities is not practical, limiting data by using a SQL Statement will be a great improvement to the Impala connector