I would like to find the user who has created/uploaded the infopath template and who last modified that template file. Is it possible to find it?
Open the site with SharePoint Designer.
On the left, click on All Files, then navigate to your library. Once there, click on the Forms folder, in there you should see a template.xsn file along with when and who modified it.
If the form is published as a content type, navigate to that library and you will find your details.
You should also be able to access this info using PowerShell.