Multiple pairs in a SINGLE DCA BOT#259

Currently, we have to create seperate DCA bots for each pair,
Instead allow us to create

1. ONE UNIFIED LONG DCA BOT with Multi Pair Select
2. ONE UNIFIED SHORT DCA BOT with Multi Pair Select

For example,
I created ONE UNIFIED LONG DCA BOT and I select following pair BTC/USDT, ETH/USDT, BNB/USDT
and when I activate it..it will open LONG position for above selected pair.