Add filter to View/Export People screen

[hughlilly]

Tēnā koutou. @Jason-Gush suggested I add this feature request here.

As a user I'd like to be able to filter by the ORCID field (i.e. the existence of data in that field) so that I can easily obtain a list of colleagues who have yet to click on the link in the Hub email and connect their ORCID accounts to the Hub.

That's this screen (and drop-down menu) here:

Ngā mihi,
Hugh