Umee v4.0 Upgrade - Historacle

This Upgrade contains the Historacle, a pricing update which improves the way we treat quickly-changing prices in the leverage module. \n * See the Historacle Design Doc for a description of how these prices are calculated: https://github.com/umee-network/umee/blob/v4.0.0/docs/design_docs/011-historacle-pricing.md \n * See the Leverage Module Spec for a description of how these prices are treated by the leverage protocol: https://github.com/umee-network/umee/blob/v4.0.0/x/leverage/README.md#historic-borrow-limit-value \n\n Please note that this upgrade also requires validators to update to Price Feeder v2.0.3: https://github.com/umee-network/umee/releases/tag/price-feeder%2Fv2.0.3 \n\n Discussion and more details: https://gov.umee.cc/discussion/9541-umee-upgrade-v40-historacle \n Relase Notes: https://github.com/umee-network/umee/releases/tag/v4.0.0