Option to not use git-LFS when initializing a repo

[yongminparks]

Similar to this suggestion in this GitHub for Unity issue

I like everything about Git for Unity, but I hope there was an option that I can choose to not use git LFS so I don't have to manually uninstall it and migrate from it everytime I make a project.

Since I assume it's tedious to remove LFS and it's remnants in an existing repo with commits,
I think it's better to let users opt-out from it at the start.

[shana]

git lfs doesn't need to be removed - it only gets used when files are marked as being tracked by lfs, in .gitattributes. I can set up an alternate initial .gitattributes file that doesn't track files in lfs, and then it won't be used.