post https://a.klaviyo.com/api/catalog-variant-bulk-create-jobs/
Create a catalog variant bulk create job to create a batch of catalog variants.
Accepts up to 100 catalog variants per request. The maximum allowed payload size is 5MB.
The maximum number of jobs in progress at one time is 500.
Rate limits:
Burst: 75/s
Steady: 700/m
Scopes:
catalogs:write