CAMEL-7135 Print with page orientation

see https://issues.apache.org/jira/browse/CAMEL-7135

- Added a new configuration property "orientation" to the lpr endpoint.
- The orientation property accepts the following values: "portrait", "landscape", "reverse-portrait", "reverse-landscape".
- The default orientation is "portrait", when property is not set or set to a wrong value.
- Implementation is according to the other configuration properties that are passed as attributes to the Java Printing Service (MediaSIzeName, Sides).
- Added tests for printing to specific page orientations.