Allocations endpoint

Added a new REST API endpoint /analytics/v1/allocations.

Supported operations:

• List allocations: Returns a list of allocations your account can access.
• Create an allocation: Creates a new allocation.
• Retrieve an allocation: Returns a specific allocation.
• Delete an allocation: Deletes a specific allocation.
• Update an allocation: Updates a specific allocation

See Allocations in the Help Center for more information about the feature.