Add option to set uploaded codelists to draft/review status rather than published

[chrisjwood16]

When uploading a csv codelist via this page https://www.opencodelists.org/users/username/new-codelist/ the codelist status is immediately set to published. Once published it isn't possible for a user to then delete the codelist.

There are possible reasons why an incomplete csv codelist might be uploaded. For example one that has been created outside OpenCodelists and needs a second check. Or uploading to OpenCodelists can be useful for easy comparison using diff when troubleshooting codelist issues.

Is it possible to default to review status? Or at least add an option to do so?