Rename CRD group and version

Replace theodolite.com/v1 by theodolite.rocks/v1beta1.

Fix #201 (closed).

theodolite-benchmarks/definitions/uc2-beam-samza/uc2-beam-samza-benchmark-operator.yaml

-apiVersion: theodolite.com/v1
+apiVersion: theodolite.rocks/v1beta1
 kind: benchmark
 metadata:
   name: uc2-beam-samza