Add test for iptcparse

[magikid]

This function parses IPTC image tags from images. It had no test coverage though. I discovered a reference image on the IPTC website so downloaded it and this test parses and validates that the iptcparse function correctly matches the tags in the image.

[SakiTakamachi]

From what I can see, there appears to be an issue with the licensing of the image regarding its usage.
https://iptc.org/tests/licensing-of-images-test-page/

Edit:
However, I'm not confident about how the licensing applies in cases where the image is not used in its original form, but rather in a modified or derivative way like this.

[magikid]

Good find. I'll see if I can either create an image myself with those tags or find one with a compatible license.