Add date filter

[hschne]

Is your proposal related to a problem?

Right now, it is not possible to filter by requests by date. Sometimes, I might want to find some request I know I had a look at a couple of days agao.

Describe the solution you'd like

Add a date filter on the data column in the profiled requests overview. This should use a popover similar to the other filters.

Ideally, a date range picker will be displayed, where the user can select a range of dates for which to filter dates.

Per default, no range should be selected. Dates before the first request, and future requests should not be selectable (i.e. the maximum range is the one for which requests exist.