Implement json-api spec compliant API for Open Event Server

Contributor

Shubham Padia

Mentors

Jutin Lee, championswimmer, Nguyễn Hồng Quân, eMBee, aviaryan, Manan Wason, Nayana Adassuriya, NiranjanRajendran, rayc, Harshit D (the-dagger), Aayush Arora, Duke Leto, Eden Dang, Victoria Bondarchuk, Elio Qoshi