Enhancements include new update_trial_subscription fields in Order APIs and added documents fields in Deal Registration APIs for improved functionality.

Order and Deal Registration APIs updated with new fields


## Added
### Enhancements
- New `update_trial_subscription` request field in the following  **Order** API:
	- `POST /v2/commerce/order`
- New `documents` response field in the following  **Deal Registration** API:
	- `GET /v2/commerce/deal_registrations/{dealRegKey}`
- New `documents` request field in the following  **Deal Registration** APIs:
	- `PATCH /v2/commerce/deal_registrations/{dealRegKey}`
	- `POST /v2/commerce/deal_registration`
- New `update_trial_subscription` response field in the following  **Order** API:
	- `GET /v2/commerce/orders/{orderReferenceId}`
