Ability to capture trees as JSON files (#1565)

Summary:

This adds a `captureTree` method intended to be injected in somewhere where you would like a JSON representation of a yoga tree (like in calculateLayout). Right now it is very simple and just calls on `nodeToString` to serialize a node into JSON, and then saves that into a file in the `benchmark` dir. Some buck file changes needed to be done as well as this is the first `.cpp` file in `benchmark`

Differential Revision: D52972995

benchmark/Benchmark.cpp

@@ -0,0 +1,32 @@
+/*
+ * Copyright (c) Meta Platforms, Inc. and affiliates.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ */
+
+#ifdef DEBUG
+
+#include <filesystem>
+#include <fstream>
+
+#include <yoga/benchmark/Benchmark.h>
+#include <yoga/debug/NodeToString.h>
+#include <yoga/enums/PrintOptions.h>
+
+namespace facebook::yoga {
+
+void captureTree(const Node* node, std::string captureName) {
+  std::string str;
+  nodeToString(str, node, PrintOptions::Style | PrintOptions::Children);
+  std::filesystem::path currentPath = __FILE__;
+  std::ofstream file;
+  file.open(
+      currentPath.parent_path().string() + "/captures/" + captureName +
+      ".json");
+  file << str;
+  file.close();
+}
+
+} // namespace facebook::yoga
+#endif

benchmark/Benchmark.h

@@ -0,0 +1,19 @@
+/*
+ * Copyright (c) Meta Platforms, Inc. and affiliates.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ */
+
+#ifdef DEBUG
+
+#pragma once
+
+#include <yoga/node/Node.h>
+
+namespace facebook::yoga {
+
+void captureTree(const Node* node, std::string captureName);
+
+} // namespace facebook::yoga
+#endif