Changes to View specific courses

added the new optional query request parameter semester

the items/sections/items/oneOf[#/components/schemas/Section]/semester response's property type changed from string to number for status 200

the items/semester response's property type changed from string to number for status 200

added the non-success response with the status 400

added the non-success response with the status 404

endpoint added

api path removed without deprecation