Improve Buy Limit Orders

[dib542]

Follows #420

The "amount" field in a Buy Limit Order should be editable, but currently achieving this is difficult

• this requires a bit of work because we can't calculate the amount in required for an amount out locally
• we should first use the work of Replace Swap estimation calculation with chain simulation data #408 to get the estimation data of a market limit order that has enough tokenIn amount and attempts to find a maxAmountOut to solve the calculation of the required amount in for a Buy target