add: furnaces are now 3x faster when players are sleeping

src/main/java/io/ib67/sfcraft/mixin/server/bridge/ServerWorldBridge.java

@@ -0,0 +1,12 @@
+package io.ib67.sfcraft.mixin.server.bridge;
+
+import net.minecraft.server.world.ServerWorld;
+import net.minecraft.server.world.SleepManager;
+import org.spongepowered.asm.mixin.Mixin;
+import org.spongepowered.asm.mixin.gen.Accessor;
+
+@Mixin(ServerWorld.class)
+public interface ServerWorldBridge {
+    @Accessor
+    SleepManager getSleepManager();
+}

src/main/resources/sfcraft.mixins.json

@@ -8,6 +8,7 @@
   "client": [
   ],
   "server": [
+    "server.AbstractFurnaceBlockMixin",
     "server.ServerHandshakeNetworkHandlerMixin",
     "server.LegacyQueryHandlerMixin",
     "server.PlayerEntityMixin",