Currently, the openshift-python-wrapper defaults the DataVolume initialization to use the "pvc" API name. To align with updated standards, we need to transition this default to "storage".

To ensure a smooth transition, we will implement this in steps:

1. Add a warning to inform consumers that the default API name will soon change from "pvc" to "storage".
2. Identify and update any existing test that rely on the implicit "pvc" default to ensure they remain functional after the swap.
3. Update the DataVolume class to use "storage" as the new default value.