Expose the appropriate associate Promotion parameters for Coupon actions, conditions

[tianyingchun]

Is your feature request related to a problem? Please describe.

Consider this Scenario

1. i have productA, productB both assign to facet 1USD

2. create promotion without coupon code, setup action with facet 1USD to give fixed amount discount

3. while add item to cart it will automatically appliy this promotion

4. i want to implement discount logics like :
   we have 2 order line, first one(productA) used1 USD discount, forsecond orderline (productB) i don't want to apply the same discount
   Describe the solution you'd like

5. for PromotionItemAction we need to know what Promotion we are dealing with, so we can check to see if that promotion has already been applied to any other order lines.

6. for any other order lines via await orderService.findOneByOrderLineId(ctx, orderLine.id) to fetch.

7. to check orderLine.discounts, orderItem.discounts

8. async execute(ctx, orderItem, orderLine, args) {.... it need to expose associatePromotion to us is fine.

 new PromotionItemAction ({
 `async execute(ctx, orderItem, orderLine, promotion, order,  args) {....` it need to expose `associate Promotion`  and current actived `Order` to us
})

Describe alternatives you've considered

Additional context
vendure@ 1.7.1