- made AttemptToGetTimeFromTrustedNode() public API

- free readclient memory after read is complete

src/app/clusters/time-synchronization-server/time-synchronization-server.cpp

@@ -356,6 +356,7 @@ void TimeSynchronizationServer::OnDone(ReadClient * apReadClient)
             SetUTCTime(kRootEndpointId, mTimeReadInfo->utcTime.Value(), ourGranularity, TimeSourceEnum::kNodeTimeCluster);
         if (err == CHIP_NO_ERROR)
         {
+            mTimeReadInfo = nullptr;
             return;
         }
     }

src/app/clusters/time-synchronization-server/time-synchronization-server.h

@@ -123,6 +123,8 @@ class TimeSynchronizationServer : public FabricTable::Delegate
     // ReadClient::Callback functions
     void OnAttributeData(const ConcreteDataAttributePath & aPath, TLV::TLVReader * apData, const StatusIB & aStatus) override;
     void OnDone(ReadClient * apReadClient) override;
+
+    CHIP_ERROR AttemptToGetTimeFromTrustedNode();
 #endif
 
     // Platform event handler functions
@@ -166,7 +168,6 @@ class TimeSynchronizationServer : public FabricTable::Delegate
 
     // Called when the platform is set up - attempts to get time using the recommended source list in the spec.
     void AttemptToGetTime();
-    CHIP_ERROR AttemptToGetTimeFromTrustedNode();
     // Attempts to get fallback NTP from the delegate (last available source)
     // If successful, the function will set mGranulatiry and the time source
     // If unsuccessful, it will emit a TimeFailure event.