CMakePM: Add "CMake Install" deployment step

This commit adds a "CMake Install" deployment step, which is using
"cmake --install" command.

"cmake --install" command has been added in CMake 3.15, this is why the
minimum CMake version has been updated to 3.15.

Note that CMakeBuildSystem::makeInstallCommand is still using cmake --
build --target install due to a CMake bug regarding "Ninja Multi-Config"
generator, which doesn't intall all binaries via "cmake --install".

Fixes: QTCREATORBUG-25880
Change-Id: I504674c380055d8ef136d344a78b80c17ecf9765
Reviewed-by: Leena Miettinen <riitta-leena.miettinen@qt.io>
Reviewed-by: Eike Ziller <eike.ziller@qt.io>
Reviewed-by: <github-actions-qt-creator@cristianadam.eu>

src/plugins/cmakeprojectmanager/cmakeabstractprocessstep.h

@@ -0,0 +1,21 @@
+// Copyright (C) 2022 The Qt Company Ltd.
+// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GPL-3.0+ OR GPL-3.0 WITH Qt-GPL-exception-1.0
+
+#pragma once
+
+#include <projectexplorer/abstractprocessstep.h>
+
+namespace CMakeProjectManager::Internal {
+
+class CMakeAbstractProcessStep : public ProjectExplorer::AbstractProcessStep
+{
+    Q_OBJECT
+public:
+    CMakeAbstractProcessStep(ProjectExplorer::BuildStepList *bsl, Utils::Id id);
+
+protected:
+    bool init() override;
+};
+
+
+} // namespace CMakeProjectManager::Internal