[Artist] Implement create Artist.

[ahmedeid6842]

requirement: 💬

At this task creation of artist should be implemented, the user will be an artist after the verify his email. so you have to only create service controller method.

To Do: ✅

• Implement POST => artists/
• check if the user isAuthenticated or not using @AuthGuard
• call createArtist service method
• if every thing is okay return 201 status
• Implement createArtist service method
  • It should accept the artist data and user who own this artist
  • verify the passed artist data with a DTO
  • create a artist for passed argument and save it.
• Implement CreateArtistDTO that validate the artist data
  • name: string, length<100
  • bio: string, length < 500
• Implement ArtistGuard
  • this guard should check if the current user is artist or not.