Support CLOB and BLOB

[christophd]

When executing update statements driver throws exception:

java.sql.SQLException: Not supported JDBC prepared statement function 'setClob'"

[christophd]

We need to transfer the CLOB data stream to the citrus-db server. Same thing for BLOB data streams. I suggest to load the CLOB stream as String data as a first implementation. The BLOB stream could be transformed into a base64 encoded String for transmission to the server.