Introduced mongo db logger for designator_integration types of topics

Two types of topics are supported by this mechanism:
* topics of message type designator_integration/DesignatorRequest, which effectively consist of one designator sent through the topic
* topics of message type designator_integration/DesignatorResponse, which effectively consist of a vector of designators sent through the topic

This also introduced two new dependencies:
* designator_integration
* designator_integration_msgs

The key/value-tree of the designators, along with their type, is transformed into BSON (~JSON) format and saved to the MongoDB.