feat: Add DirectLiquidationFee and uToken liquidation option

CHANGELOG.md

@@ -61,6 +61,7 @@ Ref: https://keepachangelog.com/en/1.0.0/
 - [1140](https://github.com/umee-network/umee/pull/1140) Rename MarketSize query to TotalSuppliedValue, and TokenMarketSize to TotalSupplied.
 - [1188](https://github.com/umee-network/umee/pull/1188) Remove all individual queries which duplicate market_summary fields.
 - [1199](https://github.com/umee-network/umee/pull/1199) Move all queries which require address input (e.g. `supplied`, `collateral_value`, `borrow_limit`) into aggregate queries `acccount_summary` or `account_balances`.
+- [1222](https://github.com/umee-network/umee/pull/1222) Add leverage parameter DirectLiquidationFee.
 
 ### Features
 
@@ -79,6 +80,7 @@ Ref: https://keepachangelog.com/en/1.0.0/
 - [1203](https://github.com/umee-network/umee/pull/1203) Add Swagger docs.
 - [1212](https://github.com/umee-network/umee/pull/1212) Add `util/checkers` utility package providing common check / validation functions.
 - [1220](https://github.com/umee-network/umee/pull/1220) Submit oracle prevotes / vote txs via the CLI.
+- [1222](https://github.com/umee-network/umee/pull/1222) Liquidation reward_denom can now be either token or uToken.
 
 ### Improvements
 

proto/umee/leverage/v1/leverage.proto

@@ -41,6 +41,14 @@ message Params {
     (gogoproto.nullable)   = false,
     (gogoproto.moretags)   = "yaml:\"small_liquidation_size\""
   ];
+  // Direct Liquidation Fee is the reduction in liquidation incentive experienced
+  // by liquidators who choose to receive base assets instead of uTokens as
+  // liquidation rewards.
+  string direct_liquidation_fee = 6 [
+    (gogoproto.customtype) = "github.com/cosmos/cosmos-sdk/types.Dec",
+    (gogoproto.nullable)   = false,
+    (gogoproto.moretags)   = "yaml:\"direct_liquidation_fee\""
+  ];
 }
 
 // Token defines a token, along with its metadata and parameters, in the Umee

proto/umee/leverage/v1/tx.proto

@@ -96,9 +96,10 @@ message MsgLiquidate {
   // Repayment is the maximum amount of base tokens that the liquidator is willing
   // to repay.
   cosmos.base.v1beta1.Coin repayment    = 3 [(gogoproto.nullable) = false];
-  // RewardDenom is the base token denom that the liquidator is willing to accept
-  // as a liquidation reward. The uToken equivalent of any base token rewards
-  // will be taken from the borrower's collateral.
+  // RewardDenom is the denom that the liquidator will receive as a liquidation reward.
+  // If it is a uToken, the liquidator will receive uTokens from the borrower's
+  // collateral. If it is a base token, the uTokens will be redeemed directly at
+  // a reduced Liquidation Incentive, and the liquidator will receive base tokens.
   string                   reward_denom = 4;
 }