Limit document quota by workspace

The DocuGen document quota is account-wide, meaning that it is a combined quota for all workspaces. The problem is that users in one workspace may exhaust all the quota for a given month, preventing users in other workspaces from generating documents until the next monthly reset, or unless they upgrade their subscription.

The idea is to empower the DocuGen admin to allocate the document quota by workspace. For example, if the account has DocuGen Standard Plan (400 documents /month), the admin should be able to assign, say, up to 400 documents /month for the Main Workspace but limit the quota to 200 documents for other workspaces.