fileapi: add cmakeFiles v1

Issue: #18398

Source/cmFileAPI.h

@@ -53,6 +53,7 @@ private:
   {
     CodeModel,
     Cache,
+    CMakeFiles,
     InternalTest
   };
 
@@ -191,6 +192,10 @@ private:
                                std::vector<RequestVersion> const& versions);
   Json::Value BuildCache(Object const& object);
 
+  void BuildClientRequestCMakeFiles(
+    ClientRequest& r, std::vector<RequestVersion> const& versions);
+  Json::Value BuildCMakeFiles(Object const& object);
+
   void BuildClientRequestInternalTest(
     ClientRequest& r, std::vector<RequestVersion> const& versions);
   Json::Value BuildInternalTest(Object const& object);