Add ability to activate foreign currency on ProductRatePlanChargeTier through the API

[Zuora-Community]

Feature Request: Add ability to activate foreign currency on ProductRatePlanChargeTier through the API.

Reference Number: DE7494

Business Need:

Need for the API to activate foreign currencies and/or the API should give the user an error message stating the foreign currency is not active.

Currently foreign currencies for Usage charges can only be activated through the UI.