Implement Secure Communication to Allow Connection with SILA edge gateway

Feature Request: Allow connecting and using SILA-Edge-Gateway(https://gitlab.com/SiLA2/sila_edge_gateway) in sila_python.

Expected behavior: Instantiating a client and connecting to a running SILA-Edge-Gateway allows to connect and access its functionalities similar to the universal sila client (https://gitlab.com/SiLA2/universal-sila-client/sila_universal_client).

Current behavior: The client can not connect to the edge-gateway. After some investigation it could be tied to sila-edge-gateway using self-signed certificates and DNS, while sila_python uses an unsecure connection.

Steps to reproduce: Clone the gateway repo and start a gateway. Instantiate a SILA client using the sila_python library and the gateways IP address and port. The client can not connect to the gateway.