fixup! Extract TimedMap from GroupingState

Author: Nikita Sokolov

core/src/main/java/com/spbsu/flamestream/core/graph/SerializableSupplier.java

@@ -0,0 +1,7 @@
+package com.spbsu.flamestream.core.graph;
+
+import java.io.Serializable;
+import java.util.function.Supplier;
+
+public interface SerializableSupplier<T> extends Serializable, Supplier<T> {
+}

core/src/main/java/com/spbsu/flamestream/core/graph/SerializableToLongFunction.java

@@ -0,0 +1,7 @@
+package com.spbsu.flamestream.core.graph;
+
+import java.io.Serializable;
+import java.util.function.ToIntFunction;
+import java.util.function.ToLongFunction;
+
+public interface SerializableToLongFunction<T> extends Serializable, ToLongFunction<T> {}