Hi Praveen, IMHO, that's a good idea!
Esp. I like to have a config that is as similar as possible to Snikket, for those, who like to selfhost, but want to avoid docker. I'm not sure, if that package should be part of prosody itself or if it should be a separate source package with a binary package, that depends on both prosody and prosody-modules. Using debconf sounds good to me, too. What do other people (in the XMPP team or outside) think about it? Cheers