OpenConnection function for open connection with mongodb once.

SetSysLog set the middleware logs here.

SetUserLog set the middleware logs here.

Collection here that we manage Logs db.

Connect if db connected or not.

DB poiner to mongoDB and can access from any where.

Log structure of the system base struct.

SystemLog that extend from base Log and for System failure and logs.

UserLog that extend Log and for the api logs.