Added quick gdown for COLMAP binary to hasten build times to 6 minutes

[AntonioMacaronio]

Background and Issues

• When a user uploads their own video, a transforms.jsonis not produced in /content/data/nerfstudio/custom_data, which is required by ns-train. Mentioned in a few issues: https://github.com/nerfstudio-project/nerfstudio/issues/2272 https://github.com/nerfstudio-project/nerfstudio/issues/2871

• Previous PR fix did not necessarily include CUDA, which could be very much needed

Overview of Changes

• Added a link to the binary of COLMAP for gdown to quickly install to the colab user's path
• Added all of its dependencies, including an OpenGl path installation fix
• Added time details of process

Impact and Other Notes

• All colab users will be able to consistently use install Nerfstudio and all its dependencies in 6 minutes or less from a new runtime.