Adding support for output annotations

[jtyr]

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This PR is adding the ability to define Annotations on the output Secret generated by the operator. This allows to consume the secret by other tools like kubernetes-reflector. This PR needs to be rebased once the PR #129 is merged to remove most of the changes in the CRD.

The Workspace can contain spec.outputAnnotations:

...
spec:
  outputAnnotations:
    foo: bar
...

Such Annotations are then inserted into the final output Secret:

$ kubectl get secret test-outputs
...
metadata:
  annotations:
    foo: bar
...

Release note for CHANGELOG:

Added ability to specify annotations for the output secret

[jtyr]

This PR is rebased now.