This commit introduces a new `changelog` command to the `borg` CLI. This command generates a human-readable changelog between two archive versions, addressing a key user request for tracking changes over time.
Key features of the `changelog` command include:
- **File Comparison:** Detects added, modified, and removed files between two archives.
- **Diff Statistics:** Calculates line-level insertions and deletions for modified files.
- **Multiple Output Formats:** Supports plain text, Markdown, and JSON output, controlled by a `--format` flag.
- **Remote Source Comparison:** Allows comparing a local archive against a remote GitHub repository using the `--source` flag (e.g., `--source github:org/repo`).
- **Commit Message Extraction:** When comparing archives that contain a `.git` repository, the command extracts and displays the relevant commit messages for each modified file, providing valuable context for the changes.
To support this functionality, this commit also includes:
- A new `pkg/changelog` package containing the core logic for comparing archives and generating change reports.
- A bugfix in `pkg/datanode` to ensure `fs.WalkDir` functions correctly on the root of a `DataNode`, which was necessary for iterating through archive contents.
- A modification to the `pkg/vcs` Git cloner to include the `.git` directory in the created `DataNode`, enabling commit history analysis.
Co-authored-by: Snider <631881+Snider@users.noreply.github.com>
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