Add SwiftPM package to build dependencies for iOS (#49361)

Summary:
Pull Request resolved: https://github.com/facebook/react-native/pull/49361

This change adds the Package.swift file that we will use to build the dependencies for React Native

## Changelog:
[Internal] - Swift PM file to build ReactNativeDependencies

Reviewed By: cortinico

Differential Revision: D69518776

fbshipit-source-id: 85006c3c5933cc6a5fd772f7b014a823d7bb99b3

packages/react-native/third-party/Package.swift

@@ -0,0 +1,42 @@
+// swift-tools-version: 6.0
+/*
+ * 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.
+ */
+
+import PackageDescription
+
+let glogUnsafeCAndCxxFlags = ["-Wno-shorten-64-to-32"]
+
+let package = Package(
+    name: "ReactNativeDependencies",
+    products: [
+        // Products define the executables and libraries a package produces, making them visible to other packages.
+        .library(
+            name: "ReactNativeDependencies",
+            type: .dynamic,
+            targets: ["glog"]
+        ),
+    ],
+    targets: [
+        // Targets are the basic building blocks of a package, defining a module or a test suite.
+        // Targets can depend on other targets in this package and products from dependencies.
+        .target(
+            name: "glog",
+            dependencies: [],
+            path: "glog",
+//            resources: [.copy("../third-party-podspecs/glog/PrivacyInfo.xcprivacy")],
+            publicHeadersPath: "./src",
+            cSettings: [
+              .headerSearchPath("src"),
+              .unsafeFlags(glogUnsafeCAndCxxFlags)
+            ],
+            cxxSettings: [
+              .headerSearchPath("src"),
+              .unsafeFlags(glogUnsafeCAndCxxFlags)
+            ]
+        ),
+    ]
+)