Add a parameter "sort" for GET /apps/

[nepoal]

SCHOOL-905:

• added a parameter "sort "for the endpoint /apps/ with options (newest, relevance)
• It is necessary to add the functionality of obtaining a rating and the number of installations of applications to sort by these parameters

SCHOOL-907: add tests for parameter "sort"
SCHOOL-908: "sort" parameter was automatically added to the swagger docs