feat: add include-commit-authors option to include author info in changelogs

[mldangelo]

Adds a new configuration option include-commit-authors that appends commit author information to changelog entries.

Example output:

feat(vehicle)!: the_commit_message (#123) (@username)

Changes

• Added CommitAuthor interface to capture author metadata (name, email, username)
• Updated GraphQL query to fetch commit author information
• Added includeCommitAuthors to ReleaserConfig and BuildNotesOptions
• Updated DefaultChangelogNotes to render author info when enabled
• Added documentation for CLI and manifest config

Behavior

When enabled:

• Displays (@username) if GitHub username is available
• Falls back to author name otherwise

Configuration

CLI:

release-please release-pr --include-commit-authors

In release-please-config.json:

{
  "include-commit-authors": true
}

---

• Make sure to open an issue as a bug/issue before writing your code! That way we can discuss the change, evaluate designs, and agree on the general idea
• Ensure the tests and linter pass
• Code coverage does not decrease (if any source code was changed)
• Appropriate docs were updated (if necessary)

Fixes #1716
Fixes googleapis/release-please-action#1063 🦕

---

Thanks for maintaining this project! Happy to make any changes needed.

[faizanminhas]

Would love to see this go in! Could someone give this a review please?

[mldangelo]

@chingor13 and @ferrarimarco would it be possible to review this? thanks!

[cdunda-perchwell]

Yes please! was just about to make this feature request! 🙏