EDSC-3093: As a user, I'd like to sort collections by start date

[macrouch]

Please review Contribution.md before contributing to this project.

Description

Earthdata Search currently has the ability to sort collections by end date, but not by start date. The sort key used for this should be start_date

Acceptance Criteria

Collections can be sorted by start date.

[krillinkills]

Hi, I would like to work on this issue

[macrouch]

@krillinkills Sorry about the slow response, I missed this comment when you originally made it. feel free to work this issue