Support git-lfs

[kieferrm]

Provide support for repositories that use git-lfs.

[joyceerhl]

The latest prerelease of GitHub Repositories on VS Code desktop supports reading LFS files from GitHub with the following setting (same goes for Azure Repos):

{
  "githubRepositories.experimental.lfs.read.enabled": true,
  "azureRepos.experimental.lfs.read.enabled": true
}

Caveats:

• No support on web yet due to CORS issues which need to be investigated
• No support for committing--needs further investigation
• No support for custom LFS server configuration in gitconfig
• Need to investigate support for Azure Repos
• Each file is retrieved with a separate request, we could improve performance and reduce network pressure by requesting multiple objects in a single request

[joyceerhl]

Latest status: we now support committing LFS files from remote repositories in VS Code desktop with Azure Repos and GitHub. We are still waiting on a CORS update from GitHub to unblock the vscode.dev/github.dev commit scenario, so assigning to April.

[joyceerhl]

LFS commit support is now available for GitHub repos in the current insiders.vscode.dev and github.dev. Tracking support for Azure Repos in vscode.dev here: #317