[safety] Accountability and Assessment for Assurance Case Elements

1. Add two attributs for ArgumentElements: "creator", "last modified" by as two string attributes. Also enable these attributes to be set in the "Properties View"

2. Add two attributs for ArgumentElements: "assessment status", "last assesment date".

For the type of "last assesment date", maybe there is a DATE data type (with day, month, year). If not, make it of type string.

For the type of "assessment status" use an enumeration, which you need to create, namely the "ASSESMENT_STATUS" enumeration, with the following members: “Not Reviewed,” “Accepted,” “Incorrect,” “Weak,” and “Review Later,”

Also enable these attributes to be set in the "Properties View"