BO18 - Create a DAL function to update a Sponsorship level

[gregoriopalama]

Add a DAL function in the Sponsorship API.

The function should accept the informations about the sponsorship level. All the informations will be updated. The informations are listed below:

• partnershipID;
• name;
• position: this will be checked. If there is an other sponsorship level with the same position, the other one will be updated and moved to the next position, and the same will be done for any other level with a colliding position.

The response will be an error if something goes wrong. Otherwise, the function will provide the updated sponsorship level object, including the ID of the document in the DB.