file: Add undocumented READ_MACHO subcommand on macOS

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

Issue: #25952

Source/cmFileCommand.cxx

@@ -35,6 +35,7 @@
 #include "cmELF.h"
 #include "cmExecutionStatus.h"
 #include "cmFSPermissions.h"
+#include "cmFileCommand_ReadMacho.h"
 #include "cmFileCopier.h"
 #include "cmFileInstaller.h"
 #include "cmFileLockPool.h"
@@ -3965,6 +3966,7 @@ bool cmFileCommand(std::vector<std::string> const& args,
     { "RPATH_CHECK"_s, HandleRPathCheckCommand },
     { "RPATH_REMOVE"_s, HandleRPathRemoveCommand },
     { "READ_ELF"_s, HandleReadElfCommand },
+    { "READ_MACHO"_s, HandleReadMachoCommand },
     { "REAL_PATH"_s, HandleRealPathCommand },
     { "RELATIVE_PATH"_s, HandleRelativePathCommand },
     { "TO_CMAKE_PATH"_s, HandleCMakePathCommand },