Add logs for future swap limit calculation (#2871)

* Add logs for future limit calculation

* Add logging category

* Fmt cpp

src/dfi/validation.cpp

@@ -1095,6 +1095,11 @@ static void LiquidityForFuturesLimit(const CBlockIndex *pindex,
         }
 
         const auto tokenAverage = tokenTotal / expectedEntries;
+        LogPrint(BCLog::FUTURESWAP,
+                 "Liquidity for future swap limit: token src id: %i, token dest id: %i, new average liquidity: %i\n",
+                 key.sourceID,
+                 key.destID,
+                 tokenAverage.GetLow64());
         cache.SetLoanTokenAverageLiquidity(key, tokenAverage.GetLow64());
     }
 }