ChangelogGenerator - CHANGELOG.md management with PR awareness
ChangelogGenerator(config: NagareConfig)
generatePRReleaseNotes(version: string,commits: ConventionalCommit[]): Promise<PRReleaseNotes>
Generate release notes with PR detection
updateChangelog(releaseNotes: ReleaseNotes | PRReleaseNotes): Promise<void>
Update CHANGELOG.md with new release notes