Finalize Masterproject

This issue contains all TODOs to finish the master project 2021:

• add SLO to CI #194 (closed) (for @she)
• open MR: prefixes !111 (merged)
• open MR: KDoc !112 (merged)
• add try-catch block for CRD deletion (see branch praesentation-operator) #211 (closed), !121 (merged)
• add job k8s file #198 (closed) !122 (merged)
• add docu for building images #144 (closed) (will be resolved in !116 (merged))
• document test covering, related to #101 (closed)
• restructure config files #195 (closed) !131 (merged)
• add clear definitions for terms execution, benchmark, experiment, resources. Maybe it make sense to change benchmark to benchmark-type or similar to make a clear distinction to the term experiment. This could also be made in !112 (merged). (maybe for @she)
• add documentation for development and execution (e.g. a README) #204 (closed) (will be resolved in !116 (merged))
• test permissions to deploy CRs (e.g. Service-Monitor), therefore we need permission to list all registered CRDs, the scope of the corresponding request is cluster-wide. #203 (closed) !119 (closed) Add support for service monitors, !120 (merged)
• change to default values #191 (closed)
• add documentation for the API of the SLO #205 (closed) !123 (merged)
• resolve the merge conflicts in !109 (merged)
• calculate the number of required instances for the load generator #210 (closed) !124 (merged)