EditionRolesDTO: add getStartDate and getEndDate

Endpoint (Method)

Params	Type	Comment
Input	Long	editionId
Output	Date/Calendar	startDate
	Date/Calendar	endDate

What does this method do?

1. When accessing an Edition through the EditionControllerApi I want to be able to call getStartDate() and getEndDate() to receive the start and end date respectively for this edition.

DTOs required

Name: EditionRolesDetailsDTO

This DTO is a:

• Create
• Patch
• View

The DTO has the following fields:

Type	Name	Comment
Date/Calendar	startDate	The start date of this edition
Date/Calendar	endDate	The end date of this edition