Module for swap orders

[catShaark]

I think osmosis should have a module for placing swap orders at any pools, just like in a regular cex where users submit buy and sell orders. Maybe we can support that feature, let's say we have many swap orders on pool 1 . Once pool 1 is changed by a swap exact amount in or a single asset join or anything, the module should check if any swap order can be fulfilled or partially fulfilled at endblocker and execute those swap orders.

I think this feature will greatly improve the UX of osmosis. I don't know why it doesn't exist on osmosis yet, I think there might be a reason like slowing down performance and if so I'd love to hear

[catShaark]

May be we can test this feature by a smart contract. Once people like it, we can build a module for it later.