[wpiutil] Add FastQueue (#7075)

This is a heavily modified version of https://github.com/cameron314/readerwriterqueue that removes
all atomics and barriers.

wpiutil/src/test/native/cpp/FastQueueTest.cpp

@@ -0,0 +1,17 @@
+// Copyright (c) FIRST and other WPILib contributors.
+// Open Source Software; you can modify and/or share it under the terms of
+// the WPILib BSD license file in the root directory of this project.
+
+#include <gtest/gtest.h>
+
+#include "wpi/FastQueue.h"
+
+TEST(FastQueueTest, Basic) {
+  wpi::FastQueue<int> q;
+  q.enqueue(25);
+
+  int item;
+  bool found = q.try_dequeue(item);
+  EXPECT_TRUE(found);
+  EXPECT_EQ(item, 25);
+}