Endpoint pendaftaran
POST /exams/{exam}/participants — Mendaftarkan peserta ke ujian
POST /exams/{exam}/participants — Mendaftarkan peserta ke ujian
GET /exams/{exam}/participants/{participant} — Status pendaftaran peserta
GET /exams/{exam}/participants/{participant} — Status pendaftaran peserta
DELETE /exams/{exam}/participants/{participant} — Membatalkan pendaftaran
DELETE /exams/{exam}/participants/{participant} — Membatalkan pendaftaran

