HaikuDepot - add column with package's date

[un_spacyar]

I think could be useful to have a column with the "package date" (date of last modification) in the package list.

Having this, you can check easily the latest packages added to the repo, by sorting by date when click on the column name.

The web version of HaikuDepot have this column.

[apl-haiku]

Duplicated by #13006