[Benchmark] add pointpillars for paddle3D benchmark

[Stinky-Tofu]

[Benchmark] add pointpillars for paddle3D benchmark

[paddle-bot[bot]]

Thanks for your contribution! Please wait for the result of CI firstly.

[CLAassistant]

Thank you for your submission! We really appreciate it. Like many open source projects, we ask that you sign our Contributor License Agreement before we can accept your contribution.
_{You have signed the CLA already but the status is still pending? Let us recheck it.}