IVGCVSW-5636 'Implement NNAPI caching functions'

* Get number of inputs and outputs from optimized network.
* Get number of cached files if backend supports caching.

Signed-off-by: Sadik Armagan <sadik.armagan@arm.com>
Change-Id: Ie02ac123bb7df9b0593a2fe46b5bb564a5994780
diff --git a/src/armnn/Network.cpp b/src/armnn/Network.cpp
index b516d51..e00dbfc 100644
--- a/src/armnn/Network.cpp
+++ b/src/armnn/Network.cpp
@@ -524,6 +524,16 @@
     return pOptimizedNetworkImpl->GetGuid();
 }
 
+size_t IOptimizedNetwork::GetNumInputs() const
+{
+    return pOptimizedNetworkImpl->GetNumInputs();
+}
+
+size_t IOptimizedNetwork::GetNumOutputs() const
+{
+    return pOptimizedNetworkImpl->GetNumOutputs();
+}
+
 Status OptimizedNetworkImpl::PrintGraph()
 {
     m_Graph->Print();
@@ -535,6 +545,16 @@
     return m_Graph->SerializeToDot(stream);
 }
 
+size_t OptimizedNetworkImpl::GetNumInputs() const
+{
+    return m_Graph->GetNumInputs();
+}
+
+size_t OptimizedNetworkImpl::GetNumOutputs() const
+{
+    return m_Graph->GetNumOutputs();
+}
+
 void ReportError(const std::string& errorMessage,
                  Optional<std::vector<std::string>&> errorMessages)
 {