Using single token to purchase LPs

The proposal is to add new options in the Exchange module where users can purchase LPs directly. Example: exchange BUSD to VAI-BUSD LP. The user inputs 100 BUSD and the system automatically calculates the LP amount to be received (i.e 100 BUSD = 98 VAI-BUSD LP). This will save time for users and allow them to directly purchase LPs.