Rewriting API endpoints to v2

[anivire]

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

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