added perf command support

src/main/java/carpet/patches/CopyProfilerResult.java

@@ -0,0 +1,54 @@
+package carpet.patches;
+
+import net.minecraft.util.profiler.ProfileResult;
+import net.minecraft.util.profiler.ProfilerTiming;
+
+import java.nio.file.Path;
+import java.util.Collections;
+import java.util.List;
+
+public class CopyProfilerResult implements ProfileResult {
+    int startI, endI;
+    long startL, endL;
+    public CopyProfilerResult(int startI, long startL, int endI, long endL)
+    {
+        this.startI = startI;
+        this.startL = startL;
+        this.endI = endI;
+        this.endL = endL;
+    }
+    @Override
+    public List<ProfilerTiming> getTimings(String parentPath) {
+        return Collections.emptyList();
+    }
+
+    @Override
+    public boolean save(Path path) {
+        return false;
+    }
+
+    @Override
+    public long getStartTime() {
+        return startL;
+    }
+
+    @Override
+    public int getStartTick() {
+        return startI;
+    }
+
+    @Override
+    public long getEndTime() {
+        return endL;
+    }
+
+    @Override
+    public int getEndTick() {
+        return endI;
+    }
+
+    @Override
+    public String getRootTimings() {
+        return "";
+    }
+}