CGMES functional logs

[nemanja-st]

Describe the current behavior

CGMES doesn't have detailed functional logs when setting values or for developer purpose.

Describe the expected behavior

CGMES import/export should have more detailed logs when:

• setting default values when value is missing
• changing values because they're invalid
• any other reason that's determined during the implementation

Describe the motivation

Detailed logs are needed to inform the user about the changes that are being made in the model, but also to document the developers intent in more detail, without having to browse through the code or github issue/PR.

Extra Information

No response