Create AssistanceItem API

[iisisrael]

AssistanceItem records need an API...

• An AssistanceItem defines the parameters of a tangible value or service that can be provided to a Client or Household during a ServiceAssistance event
• The actual tangible value or service that is provided, a ServiceAssistanceItem, is created from an AssistanceItem, like a template or default, then the ServiceAssistanceItem can be adjusted to the use case
  ** For example, an AssistanceItem record is named "Rx Money" with a default value of $20
  ** A ServiceAssistance record is created for Client Jane Doe when she applies for financial help
  ** A ServiceAssistanceItem is created from the "Rx Money" AssistanceItem, renamed "Rx Money (Insulin)", set at $23.45, and associated with the ServiceAssistance record (the AssistanceItem record does not change)
• AssistanceItem records should be allowed to be updated at any time, as they are not historical event records