Tunneling support, related UI improvements

[brentyi]

This PR adds support for a Gradio-inspired share= argument to viser.ViserServer(). This creates a shareable link that will be generally convenient + useful for Colab support. (cc @ginazhouhuiwu)

What we have is similar to #71, but doesn't require Rust or Cargo; multiprocessing + standard asyncio streams are used to handle network traffic.

Example usage:

Screen.Recording.2023-09-15.at.11.43.22.PM.mov

I also made some client updates, notably wss/https support. 🙂

[brentyi]

(note: the code feels a bit chaotic to me, but assuming things work I think we can merge as-is and do some cleanup passes after CVPR)

[tancik]

Great feature, LGTM!

[smart4654154]

Dear author,I have followed your example successfully, but unfortunately, when I attempted to use other examples, I encountered difficulties, especially with examples like Python/Examples/02_Gui.py --share. Could you please guide me on the correct operation for this? Additionally, how can I obtain a shareable link when running my data with Colab? (Unfortunately, being a beginner with limited proficiency in English, this might be a simple question, but I genuinely don't know how to resolve it. Thank you very much for your help.)

[brentyi]

Hi!

On the CLI side, this --share argument was only implemented in the SMPL-X example:

viser/examples/08_smplx_visualizer.py

Lines 36 to 41 in e8eea90

	share: bool = False,
	) -> None:
	server = viser.ViserServer()
	server.set_up_direction("+y")
	if share:
	server.request_share_url()

For getting the URL, see: https://viser.studio/server/#viser.ViserServer.request_share_url