Smart Editing for Ergo object creation expressions based on CTO models

[jeromesimeon]

Is your feature request related to a problem? Please describe.

Provide smart editing for Ergo object creation. The idea would be to be able to start writing the class e.g., Address{ and then the editor would provide a stub for the content of that class with default values.

Default values could be populated automatically, taking into account CTO defaults if present.

Additional context This issue originated from user experience discussion and requirements for Ergo Init https://github.com/accordproject/ergo/issues/734