co⚡e: Sparkplug™ MQTT edge

Refactored the code to accomodate the folloing changes;

New Struct type "SparkplugBServerConnection" represents a connection with a SparkplugB Server.

FB_Edge_of_Network_Node
Implemented a new VAR_IN_OUT Connections ARRAY [*] OF SparkplugBServerConnection,
Implemented FB_SparkplugBRotateServer into the EoN to monitor current connection and (re)connect according to
"HA Connection regime" The main body of FB_SparkplugBRotateServer still needs be implemented as the skeleton and all the burnerplate code is in place so the code works but at this moment does not rotate serverconnections yet.