Add capability to parse signal inputs and outputs from JSON input file

Summary

GridKit needs capability to automatically process signal connections for phasor dynamics models from the input file.

Rationale

Current parser capability allows for automatically assembling systems connected through electrical buses. A capability to add control devices to machines depends on ability to add signal connections to different machine variables. For example, some governors would take machine speed as the input, while others will take injection current. The machine needs to identify what variable will be connected to the signal node based on the input data.

Description

There are several steps to implement this:

• Expand JSON file format to include optional signal inlets and outlets for the components.
• Define signal inlet and outlet connection in component's *Data files.
• Consider adding to the base Component class methods to connect variable to a signal node.

Additional information

No response