Publish vscode types

We are using @types/vscode for publishing vscode.d.ts. See https://github.com/Microsoft/vscode/issues/70175 for details.

For each release, we will need to publish a new version to DefinitelyTyped. Here are the steps:

1. When you publish a tag such as 1.34.0, a new commit will be created at https://github.com/microsoft/vscode-DefinitelyTyped with commit message VS Code 1.34.0 Extension API.
2. Use this link to send a PR to DefinitelyTyped.
3. Ask either @octref, @jrieken, @kieferrm or @egamma to merge the PR.
4. @types/vscode will be published in ~10 minutes.