A pull request in Git is typically used to ask someone, using his own repo, to pull changes from another repo (which is a clone of the original repo).
SVN only uses one repo for everybody, so the closest matches to a pull request would be:
- you developed a feature in a branch, and ask the trunk maintainer to reintegrate your branch into the trunk
- you developed a feature in your own working copy of the trunk, and send a patch file to the trunk maintainer in order to commit the changes into the trunk.