A test program example of using switchboard VRF for randomness in a raffle game. Highly inspired from draffle's program and Switchboard's vrf-flip program
draffle program - https://anchor.projectserum.com/program/dRafA7ymQiLKjR5dmmdZC9RPX4EQUjqYFB3mWokRuDs
switchboard vrf-flip - https://github.com/switchboard-xyz/vrf-flip