Add fee curve to Thorchain LP

[0xean]

Overview

TDMC has voted on the below params for the fee's on TC LP

Acceptance Criteria

• fee model implemented for TC LP depoosit

[twblack88]

Vote has quorum :https://discord.com/channels/554694662431178782/920449863408287855/1207415430025580627

params :
max_discount=1_000_000 FOX
no_fee=2_000 USD;
max bps=50;
min bps=20;
midpoint usd=50_000;
steepness=80_000;
delay_hr=7

[0xean]

AC:

• UI display
• Separate out params for LP vs Swapper and allow them to be defined in the env file