Implement optional namespace in resource k8s_manifest

[Alegrowin]

Is your feature request related to a problem? Please describe.
I was trying to use helm to generate my resources and apply them in a dedicated namespace. The main problem is when updating a version, I have to go back in every resource to set the namespace.

helm fetch stable/nginx-ingress --version 1.24.4 --untardir charts --untar
helm template --namespace nginx-ingress .\charts\nginx-ingress --output-dir manifests/

Describe the solution you'd like to see
I would like to be able to use the optional namespace field to set the initial namespace of a resource.