Add a way to report import user messages when using the feature "Import Object From Text" in case of a SucessPayload

[adaussy]

When using "Import Object From Text" feature, we can report error messages in case of ErrorPayload but messages returned with a SuccessPayload are not handled. Those messages could be in case of partial import or failure during resolution process.

I think the same kind of approach used "Upload Model" feature should be used here.

[jessymallet]

I confirm this need on the "Upload model" functionality.

Some examples of incomplete/failed import that need to be report with some log:

• unknown concept in the file to import (concepts not yet implemented in SysON or concept from another library which is not referenced as import statement in the file)
• some elements are badly named and use Sysml keyword as name