Publish basic status of file writer `Master`

Created by: dominikwerder

• Let the user define a status-uri either via the command line or the configuration file to specify on which Kafka topic the file writer should publish the status
• Publish the basic list of files which are currently being written
• Prepared to pass the shared status producer to StreamMaster which in turn will publish more details about each file being written
• The overall status of each file being written will be contained in the published json after DM-450 lands