refactor `kube-prometheus-stack` into `monitoring` chart

.../templates/clusterauditor/clusterauditor-helmrelease.yaml

...s/clusterauditor/clusterauditor-policies-helmrelease.yaml

chart/templates/gatekeeper/gatekeeper-helmrelease.yaml

chart/templates/istio/istio-controlplane-helmrelease.yaml

chart/templates/istio/istio-operator-helmrelease.yaml

chart/templates/logging/ek-helmrelease.yaml

chart/templates/logging/fluentbit-helmrelease.yaml

chart/templates/monitoring/monitoring.yaml

chart/values.yaml

examples/complete/envs/dev/kustomization.yaml

examples/complete/envs/dev/patch-bigbang.yaml