In this case all the commits are against one file, so I’d suggest squashing them all into one commit and making a PR with bullet points that explains what changed. It needn’t go through every line but the general gist would be a good thing for historical purposes.
Also since it’s an importer and those are largely untested it’s a lot safer - if you break it the next person who does an import will notice but it’s not going to break any discourse sites in production.