🛂 (server): Get Google refereshToken after login for Google Calendar API usage

[tkhwang]

Description

Google OAuth login 시에 accessToken 과 함께 refereshToken 얻기.

• 해당 app 연동 시 최초 한 번 만 가능.
  • access_type = offline
  • prompt = consent

Type of change

• [ ] 💥 Breaking change (fix or feature that would cause existing functionality to not work as expected)
• [ ] ✨ New feature (non-breaking change which adds new functionality)
• [ ] 🐛 Bug fix (non-breaking change which fixes an issue)
• [X] ♻️ Refactor (non-breaking change which refactors code)
• [ ] 🩹 Chore (non-breaking change which changes the small things)
• [ ] 📝 This change requires a documentation update

Further to-do lists

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