Draft: Auto add baremetal hosts to snmp monitoring

This MR adds a kyverno policy that adds the needed information for bmh monitoring based on a label and annotations added to the baremetal hosts:

  baremetal_hosts:
    server1:
      bmh_metadata:
        labels:
          snmp-enabled: "true"
        annotations:
          sylva.org/snmp-auth: dell1
          sylva.org/snmp-hw-type: dell
          sylva.org/snmp-endpoint: http://192.168.133.1:5432

the resulting configmap containing:

apiVersion: v1
data:
  snmp_management-cluster-management-cluster-server1.yaml: |
    - targets: ['http://192.168.133.1:5432']
      labels:
        auth: 'dell1'
        module: 'dell'
        alias: 'server1'
        sylva_cluster: 'management-cluster'

Related to !1888 (merged) and completed by sylva-projects/sylva-elements/helm-charts/sylva-capi-cluster!304 (merged) Closes: #532 (closed)