LPS-51488 truncation error on DLFolder name column during portlet import

Hi Jonathan,
Currently, portlet imports fail when a truncation error occurs for the DLFolder name because the it exceeds 100 char.
Solution:
Protected method uses SHA-256 to create a hash to be stored in the db instead, so that 64 char will always be stored in the db for temp file entries.
There are three tests provided to test the reliability of the hash creation.