Add APIs to access default SessionKeystore & PersistentStorageDelegate (project-chip#36566)

* Add APIs to access default SessionKeystore & PersistentStorageDelegate

* Restyled by whitespace

---------

Co-authored-by: Restyled.io <commits@restyled.io>

Author: yufengwangca

examples/platform/linux/CommissionerMain.cpp

@@ -457,4 +457,14 @@ CommissionerDiscoveryController * GetCommissionerDiscoveryController()
     return &gCommissionerDiscoveryController;
 }
 
+SessionKeystore * GetSessionKeystore()
+{
+    return &gSessionKeystore;
+}
+
+PersistentStorageDelegate * GetPersistentStorageDelegate()
+{
+    return &gServerStorage;
+}
+
 #endif // CHIP_DEVICE_CONFIG_ENABLE_BOTH_COMMISSIONER_AND_COMMISSIONEE

examples/platform/linux/CommissionerMain.h

@@ -28,7 +28,9 @@
 
 #if CHIP_DEVICE_CONFIG_ENABLE_BOTH_COMMISSIONER_AND_COMMISSIONEE
 
+using chip::PersistentStorageDelegate;
 using chip::Controller::DeviceCommissioner;
+using chip::Crypto::SessionKeystore;
 using chip::Transport::PeerAddress;
 
 CHIP_ERROR CommissionerPairOnNetwork(uint32_t pincode, uint16_t disc, PeerAddress address);
@@ -39,5 +41,7 @@ void ShutdownCommissioner();
 
 DeviceCommissioner * GetDeviceCommissioner();
 CommissionerDiscoveryController * GetCommissionerDiscoveryController();
+SessionKeystore * GetSessionKeystore();
+PersistentStorageDelegate * GetPersistentStorageDelegate();
 
 #endif // CHIP_DEVICE_CONFIG_ENABLE_BOTH_COMMISSIONER_AND_COMMISSIONEE