Add initial database setup and user/artist management functionality

api/queries/artists.sql

@@ -0,0 +1,9 @@
+-- artists.sql
+-- name: GetArtistByID :one
+SELECT * FROM artists WHERE id = $1;
+
+-- name: GetAllArtists :many
+SELECT * FROM artists;
+
+-- name: CreateArtist :one
+INSERT INTO artists (id, name, genre, bio, artist_image_url) VALUES ($1, $2, $3, $4, $5) RETURNING id;