file: Add undocumented READ_MACHO subcommand on macOS

Provide a way to parse the architectures of a Mach-O binary.

Issue: #25952

Source/cmFileCommand_ReadMacho.h

@@ -0,0 +1,11 @@
+/* Distributed under the OSI-approved BSD 3-Clause License.  See accompanying
+   file Copyright.txt or https://cmake.org/licensing for details.  */
+#pragma once
+
+#include <string>
+#include <vector>
+
+class cmExecutionStatus;
+
+bool HandleReadMachoCommand(std::vector<std::string> const& args,
+                            cmExecutionStatus& status);