Support for replica(read/write)

[nilpntr]

I'm trying to setup bun to split the read and write queries over 2 url's(1 for read/write and one for read only). The problem is bun.NewDB is expecting an sql.DB struct but maybe it should expect an interface implementing all the sql.DB functionality which makes room for these type of setups. Are you guys planning on having such things in the future?

[vmihailenco]

Duplicate of #1037