cmake_path command: path management

Fixes: #19568, #20922

Source/cmCMakePathCommand.h

@@ -0,0 +1,14 @@
+/* Distributed under the OSI-approved BSD 3-Clause License.  See accompanying
+   file Copyright.txt or https://cmake.org/licensing for details.  */
+
+#pragma once
+
+#include "cmConfigure.h" // IWYU pragma: keep
+
+#include <string>
+#include <vector>
+
+class cmExecutionStatus;
+
+bool cmCMakePathCommand(std::vector<std::string> const& args,
+                        cmExecutionStatus& status);