Stream large CSV files

I was reading the [django documentation on CSV output in views](https://docs.djangoproject.com/en/4.2/howto/outputting-csv/).

We don't have to follow Django's suggestions, of course, but I was wondering about their advice to use a `StreamingHttpResponse` for large files. If permitted, users might download very large CSV files from I-analyzer, but I'm not sure if this can cause issues at the moment. If so, this could be worth looking into.

The issue names no project file or test. Start with the linked Django CSV-output documentation and trace the current I-analyzer CSV response path; determine whether large downloads need streaming and establish a concrete, tested completion criterion.

Written by the indexing model from the issue text.