Support to define namespace for devspace helm deployment

[Rishang]

I want to use devspace in order to deploy helm charts for various applications which are using different snaespace and I can configure/manage/deploy them via a single devspace.yaml file. This will be very helpful

version: v2beta1
deployments:
  prefect-server:
    helm:
      chart:
        name: prefect-server
        repo: https://prefecthq.github.io/prefect-helm
        
        namespace: prefect        # need this feature
        createNamespace: true  # need this feature
      
      valuesFiles: 
        - ./helm/values/prefect-server/values.yaml
  nginx:
    helm:
      chart:
        name: ingress-nginx
        repo: https://kubernetes.github.io/ingress-nginx
        namespace: ingress-nginx    # need this feature
        createNamespace: true         # need this feature
      valuesFiles: 
        - ./helm/values/ingress-nginx/values.yaml