Clean up the resource type definitions

[rgarver]

The current resource type definitions are messy and difficult to parse in Typescript and IDE hints. Resources like SubscribePro.V2.Customers and others should be simplified and easy to parse, eg:

type CustomersServiceType = {
  getOne({ client, id }: { client?: Client; id: string | number; }): Promise<CustomerType | null>
  getAll({ client, params }: { client?: Client; params?: CustomerSearchParams; }): Promise<SearchResults<CustomerType[]>>
  updateOne({ client, id, data }: { client?: Client; id: string | number; data: UpdateCustomerType; }): Promise<CustomerType | null>;
  createOne({ client, data }: { client?: Client; data: CreateCustomerType; }): Promise<CustomerType | null>;
};