Add support for generating Helm charts when creating a deployment (#974)

Part of https://plan.wireit.in/deepstack/browse/VUL-265/

- Added a flag `--helm-chart` to `deploy create` command
- Uses Kompose CLI wrapper to generate a helm chart from compose files in a stack
- To be handled in a follow on PR(s):
  - Templatize generated charts and generate a `values.yml` file with defaults

Reviewed-on: cerc-io/stack-orchestrator#974
Co-authored-by: Prathamesh Musale <prathamesh.musale0@gmail.com>
Co-committed-by: Prathamesh Musale <prathamesh.musale0@gmail.com>

stack_orchestrator/deploy/webapp/deploy_webapp.py

@@ -91,6 +91,7 @@ def create_deployment(ctx, deployment_dir, image, url, kube_config, image_regist
         deploy_command_context,
         spec_file_name,
         deployment_dir,
+        False,
         None,
         None
     )