[nrf noup] Enhance/Optimize attach to thread network

Enhance attaching to Thread by verifying if the
current dataset is the same as provided.
In current solution implementation will not
reset the Thread interface while the dataset
are equal to the active dataset.

Signed-off-by: Michał Szablowski <michal.szablowski@nordicsemi.no>

src/platform/OpenThread/GenericThreadStackManagerImpl_OpenThread.cpp

@@ -353,6 +353,14 @@ template <class ImplClass>
 CHIP_ERROR GenericThreadStackManagerImpl_OpenThread<ImplClass>::_AttachToThreadNetwork(
     const Thread::OperationalDataset & dataset, NetworkCommissioning::Internal::WirelessDriver::ConnectCallback * callback)
 {
+    Thread::OperationalDataset current_dataset;
+    // Validate the dataset change with the current state
+    ThreadStackMgrImpl().GetThreadProvision(current_dataset);
+    if (dataset.AsByteSpan().data_equal(current_dataset.AsByteSpan()) && callback == nullptr)
+    {
+       return CHIP_NO_ERROR;
+    }
+
     // Reset the previously set callback since it will never be called in case incorrect dataset was supplied.
     mpConnectCallback = nullptr;
     ReturnErrorOnFailure(Impl()->SetThreadEnabled(false));