Add kube-prometheus-stack, loki-stack & monitoring-config

[darkowlzz]

Based on https://github.com/fluxcd/flux2/pull/4116. The monitoring configurations are being updated and moved to this repository. The old configurations in flux2 repository will no longer be recommended and may be removed in a future release. Refer https://github.com/fluxcd/flux2/issues/4128 for more details.

• Kube-prometheus-stack helm release values have been updated to deploy kube-state-metrics to watch and export flux custom resources only.
• loki-stack has be copied from flux2 configuration.
• monitoring-config has been updated to use the kube-state-metrics Flux resource metrics in the cluster dashboard.
• The deprecated graph panels used in the dashboards have been updated to use the new time series panels.