feat: Add git-lfs support for ignoring files under its control

[adamhill]

TL;DR;

We need to ignore large binary files being managed by git-lfs returned by the command git lfs ls-files -n. We also might need to strongly suggest the user turn off checkpoint if this list is collectively large.

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There is an extension for handling large binary files in git called git-lfs. It lets them be stored in git, but not versioned (or versioned with very specific rules) Roo does not know about this and happily gobbles up these files for no gain.

Sometimes they will live in the same directory like Assets/ but sometimes they are scattered throughout the repo.

.rooignore can handle a lot of the cases, but when it can't it would be nice if we could automatically ask git-lfs for the file list. It has the capability - git-lfs/git-lfs#5313

The command is git lfs ls-files -n we actual have one tracked in the roo-code repo - assets/docs/demo.gif

We have already had one user bitten by this with an Unreal project in VSC - See this support ticket

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Fix:

Get that list when we read the .{roo|git|ignore files and ignore them. Turn off ourselves or strongly suggest the user disable checkpoints.

[cte]

Just to be clear, these files won't be listed here?: https://github.com/RooVetGit/Roo-Code/blob/main/src/services/checkpoints/excludes.ts#L186