Describe the feature or problem you’d like to solve

Currently it is impossible to tell whether or not files have been removed (or created, modified) from the gh pr list command; the gh api command does work for this, but does seem reasonable to add to the list output.

Proposed solution

Adding the status field to the files metadata (as returned by the gh api repos/{owner}/{repo}/pulls/{number}/files command) would be very useful for further processing.

Additional context

Example:

gh pr list --json files returns

{
    "files": [
      {
        "path": "docs/markdown.md",
        "additions": 1,
        "deletions": 1
      },
}

am proposing:

{
    "files": [
      {
        "path": "docs/markdown.md",
        "additions": 1,
        "deletions": 1,
        "status": "removed"
      },
}

Where status is { "added" | "modified" | "removed" }