BE: Reset User Password & Create CTF & Create Event

Added change-password/ create ctf/ create event endpoint with JWT expiration check and password update functionality Excepted input: -HTTP Header:Autorization:JWT -Req body for change-password:{"oldPassword":oldPassword,"newPassword":newPassword} -For CTFs, req body includes all fields: ctfName,points,numSolves,createDate,isDinamic,urlCtf,description,difficulty,nameLink,fkEvents -For EVENTs, req body includes all fields: eventName,startDate,endDate