Store Scope in OLPHttpClient to prolong lifetime (#1619)

An attempt to make static objects to live long enough when parent
objects are destructed randomly

Resolves #1613
Relates-To: HERESDK-6943

Signed-off-by: Rustam Gamidov <ext-rustam.gamidov@here.com>

Author: rustam-gamidov-here

olp-cpp-sdk-core/src/http/ios/OLPHttpClient.mm

@@ -25,6 +25,7 @@
 #include <sstream>
 
 #include "context/ContextInternal.h"
+#include "olp/core/context/Context.h"
 #include "olp/core/context/EnterBackgroundSubscriber.h"
 #include "olp/core/http/Network.h"
 #include "olp/core/logging/Log.h"
@@ -80,6 +81,7 @@ @interface OLPHttpClient ()<NSURLSessionDataDelegate>
 @implementation OLPHttpClient {
   NSOperationQueue* _delegateQueue;
 
+  olp::context::Context::Scope _scope;
   std::shared_ptr<EnterBackgroundSubscriberImpl> _enterBackgroundSubscriber;
 }