[V3] Raffle custom win/pick message

[skeith]

Is your feature request related to a problem? Please describe.
Not a problem, I am fine thanks.
What I am requesting is to make raffle win / pick message can be customised or we can add custom message below the default one

Describe the solution you'd like
Currently, raffle default win message is this
Congratulations {user.mention} You have won the raffle!

Allow us, like v2 lottery (IIRC), to define custom message or add custom message using setraffle command

Additional context
EOF Ish-shuuu