[C] Optimize memory usage when printing JSON (#18072)

* cJSON generate unformatted json to save memory during large objects handling

* update sample

* add option to use cjson print unforamtted in client

* remove unused test template files

* add new samples

* update workflow

* update doc

* fix model filename

* fix inclulde

---------

Co-authored-by: Hemant Zope <42613258+zhemant@users.noreply.github.com>
Co-authored-by: Hemant Zope <hemantzope2008@gmail.com>

samples/client/petstore/c-useJsonUnformatted/api/UserAPI.h

@@ -0,0 +1,72 @@
+#include <stdlib.h>
+#include <stdio.h>
+#include "../include/apiClient.h"
+#include "../include/list.h"
+#include "../external/cJSON.h"
+#include "../include/keyValuePair.h"
+#include "../include/binary.h"
+#include "../model/user.h"
+
+
+// Create user
+//
+// This can only be done by the logged in user.
+//
+void
+UserAPI_createUser(apiClient_t *apiClient, user_t *body);
+
+
+// Creates list of users with given input array
+//
+void
+UserAPI_createUsersWithArrayInput(apiClient_t *apiClient, list_t *body);
+
+
+// Creates list of users with given input array
+//
+void
+UserAPI_createUsersWithListInput(apiClient_t *apiClient, list_t *body);
+
+
+// Delete user
+//
+// This can only be done by the logged in user.
+//
+void
+UserAPI_deleteUser(apiClient_t *apiClient, char *username);
+
+
+// Get user by user name
+//
+user_t*
+UserAPI_getUserByName(apiClient_t *apiClient, char *username);
+
+
+// Logs user into the system
+//
+char*
+UserAPI_loginUser(apiClient_t *apiClient, char *username, char *password);
+
+
+// Logs out current logged in user session
+//
+void
+UserAPI_logoutUser(apiClient_t *apiClient);
+
+
+// test integer and boolean query parameters in API
+//
+// This can test integer and boolean query parameters in API.
+//
+void
+UserAPI_testIntAndBool(apiClient_t *apiClient, int *keep, int *keepDay);
+
+
+// Updated user
+//
+// This can only be done by the logged in user.
+//
+void
+UserAPI_updateUser(apiClient_t *apiClient, char *username, user_t *body);
+
+