Introduce events in order to make it possible to see simple log message with...

Introduce events to display simple log message with kubectl describe execution

Looks like this:

Events:
  Type     Reason                        Age    From                 Message
  ----     ------                        ----   ----                 -------
  WARNING  Start experiment failed       5m22s  theodolite-operator  load: 25000, resources: 1
  WARNING  Stop experiment failed        5m21s  theodolite-operator  Teardown failed: Failed to create new KafkaAdminClient

At the moment events are created when an experiment is started or stopped or when the execution fails.

Closes #245 (closed)

added 1 commit

• 23439e3a - fix test

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changed the description

Another question: What happens in standalone mode with the event creator?

added 8 commits

• 23439e3a...d7805178 - 6 commits from branch she:master
• b0d57fe2 - Merge branch 'master' of git.se.informatik.uni-kiel.de:she/theodolite into introduce-k8s-events
• 3525a05c - minor code changes

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as discussed in person: Read mode from env variable again

added 42 commits

• 3525a05c...f8211093 - 41 commits from branch she:master
• d18a6a06 - Merge branch 'master' of git.se.informatik.uni-kiel.de:she/theodolite into introduce-k8s-events

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changed milestone to %0.6.0

assigned to @she

added 24 commits

• d18a6a06...7ae57818 - 22 commits from branch she:master
• 3cd94b43 - Merge branch 'master' of git.se.informatik.uni-kiel.de:she/theodolite into introduce-k8s-events
• dcab3da4 - Check if Theodolite is running in operator mode before creating K8s events

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