Introduce action commands

This MR introduces actions which could be performend before and after experiments.

Closes #270 (closed)

theodolite/src/main/kotlin/theodolite/benchmark/KubernetesBenchmarkDeployment.kt

@@ -40,8 +40,6 @@ class KubernetesBenchmarkDeployment(
     private val LAG_EXPORTER_POD_LABEL_NAME = "app.kubernetes.io/name"
     private val LAG_EXPORTER_POD_LABEL_VALUE = "kafka-lag-exporter"
 
-
-
     /**
      * Setup a [KubernetesBenchmark] using the [TopicManager] and the [K8sManager]:
      *  - Create the needed topics.