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)

theodolite/src/main/kotlin/theodolite/k8s/K8sManager.kt

@@ -46,8 +46,7 @@ class K8sManager(private val client: NamespacedKubernetesClient) {
                 this.client.apps().deployments().delete(resource)
                 ResourceByLabelHandler(client = client)
                     .blockUntilPodsDeleted(
-                        labelName = "app",
-                        labelValue = resource.spec.selector.matchLabels["app"]!!
+                        matchLabels = resource.spec.selector.matchLabels
                     )
                 logger.info { "Deployment '${resource.metadata.name}' deleted." }
             }
@@ -59,8 +58,7 @@ class K8sManager(private val client: NamespacedKubernetesClient) {
                 this.client.apps().statefulSets().delete(resource)
                 ResourceByLabelHandler(client = client)
                     .blockUntilPodsDeleted(
-                        labelName = "app",
-                        labelValue = resource.spec.selector.matchLabels["app"]!!
+                        matchLabels = resource.spec.selector.matchLabels
                     )
                 logger.info { "StatefulSet '$resource.metadata.name' deleted." }
             }