Change rate curve for USDe market on LlamaLend

Abstract:

After Ethena announced points for sUSDe and USDe markets on LlamaLend, utilization of the market briefly went up to 100%. This is a sign of the maximum borrow rates being not high enough given the market demand.

Therefore, I propose to modify the rate curves.

Specification:

USDe market uses a usual (non-custom) rate curve for LlamaLend:

rate = (max_rate / min_rate)**utilization * min_rate

Here is a comparison of parameters:

Old:

    min_rate = 0.5%
    max_rate = 25%

New:

    min_rate = 0.5%
    max_rate = 40%

Old rate curve is shown with a dashed line, and new one is the solid line:
usde-proposed-rates

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