Use Titan CC Avro Records in UC App and Workload Generator

Closes #1, #10, #16, #18, and #34

See merge request !28

Add Distributed Workload Generator

Closes #18, #16, #10, and #28

See merge request !6

Clean up script names

Closes #37

See merge request !11

# Conflicts:
#   execution/uc1-workload-generator/deployment.yaml
#   execution/uc2-workload-generator/deployment.yaml
#   execution/uc3-workload-generator/deployment.yaml
#   execution/uc4-workload-generator/deployment.yaml

Resolve "Use Docker images from theodolite DockerHub organization"

Closes #55

See merge request !31

Resolve "Add deployment for Git tags"

Closes #57

See merge request !30

Resolve "Add equals/hash methods for serializable classes"

See merge request !29

As ints will not be null on a null check, better check for the values
of an int.

Merge branch '46-add-benchmarking-strategies' of git.se.informatik.uni-kiel.de:stu200776/spesb into 46-add-benchmarking-strategies

Send avro data with the producer to kafka.

Replace the kieker records with the avro records from titan.
Further use the builder pattern in the KafkaRecordSender to enable
creation with different parameters.

Abstract the Interface to be more generic.