Add an option to open export links in a new tab in Views Data Export

I have added a version of this module, which allows me to open the csv in another tab.

Oh nice! This would be a great little feature I reckon.

+++ b/templates/export-icon.html.twig
@@ -12,6 +13,6 @@
-<a href="{{ url }}"{{ attributes.addClass('feed-icon') }}>
+<a target="{{ target }}" href="{{ url }}"{{ attributes.addClass('feed-icon') }}>

I wonder if we can get the target into the attributes here?

Does this need a test to make sure that the link is getting generated with the appropriate target?

I converted the patch in #2 into MR!71

Let's try to make that cleanup I mentioned in #4 and add some tests.