Rewriting API endpoints to v2

[anivire]

Rewriting API endpoints for better DX, which includes some of architecture changes and services implementation

• [x] /v2/artists
  • [x] /search
  • [x] /random
  • [x] /edit/:id/
  • [x] /edit/bulk
  • [x] /update/:id/
  • [x] /update/bulk
  • [x] /create
  • [x] /create/bulk
• [ ] /v2/trends
  • [ ] /get/:id
  • [ ] /create/:id
  • [ ] /create/bulk
• [ ] /v2/suggestions
  • [x] /search
  • [ ] /create
• [ ] /v2/auth
  • [ ] /github
  • [ ] /github/callback
  • [ ] /github/revalidate
  • [ ] /logout