add --create-state-namespace flag

[lukasmrtvy]

Would be great to have flag ( --create-metadata-namespace for example ) for precreating namespace for metadata.

Thanks

[cppforlife]

it's probably worth adding --state-namespace and --create-state-namespace flags at the same time. --state-namespace will set namespace where to store app record (takes precedence to --namespace).

[doddatpivotal]

Great idea. I found myself wanting the same feature.