Add example pick-place script based on primitives

[Alacarter]

Made this standalone pick-and-place example script since rs_int_example.py on og-develop (at least, as it was a couple weeks ago) wasn't easy to debug for me. Some of the code (such as env configs, reset functions) is based on @Arpitrf's OG fork.

• Gets ~90% scripted accuracy on stationary pick-and-place.
• Includes utilities for logging videos for each episode.
• This PR includes the changes from PR Fix tensor type issues on og-develop #903 which I'd recommend merging first before merging this one.

You can test this script by running:

python omnigibson/examples/action_primitives/pick_place_example.py --out-dir [.../video-out-dir] --num-trajs 1