Adding nvs-bench

[N-Demir]

Just wanted to leave a PR with the code needed to replicate brush's results on nvs-bench. No worries if you don't want it merged in. But my thought is at least other people can see how easy it is to run and setup.

What's in the PR?

Filled out boilerplate files for running brush on a remote modal gpu instance.

Results

Average across the whole benchmark (see renders at nvs-bench.github.io)

PSNR: 27.085 | SSIM: 0.8652 | LPIPS: 0.2524

Mipnerf360

Scene	PSNR	SSIM	LPIPS
bicycle	25.721	0.7907	0.2026
bonsai	32.297	0.9446	0.2420
counter	29.254	0.9136	0.2443
flowers	21.592	0.6317	0.3046
garden	27.818	0.8713	0.1165
kitchen	31.830	0.9298	0.1510
room	32.224	0.9264	0.2704
stump	27.241	0.8033	0.2103
treehill	23.212	0.6594	0.3293
Average	27.910	0.8301	0.2301

Tanksandtemples

Scene	PSNR	SSIM	LPIPS
train	22.723	0.8464	0.1891
truck	26.339	0.8954	0.1390
Average	24.531	0.8709	0.1640

Deepblending

Scene	PSNR	SSIM	LPIPS
drjohnson	29.449	0.9111	0.3106
playroom	30.246	0.9114	0.3134
Average	29.847	0.9112	0.3120

Zipnerf

Scene	PSNR	SSIM	LPIPS
alameda	22.783	0.7783	0.3212
berlin	27.426	0.9040	0.3029
london	26.482	0.8407	0.3255
nyc	27.517	0.8721	0.2644
Average	26.052	0.8488	0.3035