Server: add an OPC UA service call connection/session context in server callbacks
Create a connection/session context accessible in server callbacks related to an OPC UA service call.
The context type is abstract and should provide through dedicated functions applied to a context pointer:
- Secure channel security policy and mode used to call the service
- Session user that call the service It might be extended by adding new functions in the future.
The context type will be provided in the following callbacks:
- AddressSpace notification callback (SOPC_AddressSpaceNotif_Fct) / Write notification callback (SOPC_WriteNotif_Fct) in server wrapper API
- MethodCall methods callback (SOPC_MethodCallFunc_Ptr) It might be used in other server callbacks in the future.