Automatically create non-existent namespace during `kubectl kudo install --namespace=$namespace $operator`

**What would you like to be added**:

Automatic creation of non-existent namespaces during `kubectl kudo install
--namespace=$namespace $operator`.

**Why is this needed**:

Convenience.

Start by tracing the `kubectl kudo install --namespace=$namespace $operator` command entry point and the existing namespace handling during installation. Confirm how a missing namespace currently behaves, then verify that installation creates the requested namespace before proceeding.

Written by the indexing model from the issue text.