Add support for long-running infrastructure components

This MR introduces a field called "Infrastructure" in the benchmark specification. This allows specifying Kubernetes resources that are deployed/removed before/after the whole execution.

Closes #272 (closed)

theodolite/crd/crd-benchmark.yaml

@@ -24,7 +24,7 @@ spec:
             properties:
               name:
                 description: This field exists only for technical reasons and should not be set by the user. The value of the field will be overwritten.
-                type: string  
+                type: string
               resourceTypes:
                 description: A list of resource types that can be scaled for this `benchmark` resource. For each resource type the concrete values are defined in the `execution` object.
                 type: array