Add support for extra manifests

[leshukov]

Is your feature request related to a problem? Please describe

Please add support for extra manifests, for example, add a file to the template folder extra-manifests.yaml:

{{- range .Values.extraManifests }}
---
{{ toYaml . }}
{{- end }}

and to values.yaml:

# Extra manifests to deploy as an array of objects
extraManifests: []
  # - apiVersion: v1
  #   kind: ConfigMap
  #   metadata:
  #     name: example-configmap
  #   data:
  #     key: value

Or you can choose your own realisation of this feature.
Thanks.

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Additional context

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