[FEATURE REQUEST] Allow the canonical object-store named to be decided during setup

[JakeChampion]

Is your feature request related to a problem? Please describe.
When deploying the same object-store starter-kit twice, it currently fails due to both trying to create a store of the same name.

✗ Creating object store 'my-store'...

ERROR: the Fastly API returned 409 Conflict: Conflict (store with name 'my-store' already exists).

Describe the solution you'd like
I'd like an interactive option which notices the store already exists and then prompts the user with a few questions such as:

$ An Object Store named xxyyzz already exists. Please choose from below options:
[1] Use the already existing Object Store
[2] Create a Object Store with a different name

$ 2
Object-Store: [xxyyzz] xxyyzz-jake

Describe alternatives you've considered
I don't have an alternative unfortunately

Additional context
Add any other context or screenshots about the feature request here.