move queries to db folder, change database to better accommodate musicbrainz api data

db/queries/artists.sql

@@ -0,0 +1,18 @@
+-- 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;
+
+-- name: UpdateArtist :exec
+UPDATE artists SET name = $2, genre = $3, bio = $4, artist_image_url = $5 WHERE id = $1;
+
+-- name: DeleteArtist :exec
+DELETE FROM artists WHERE id = $1;
+
+-- name: SearchArtists :many
+SELECT * FROM artists WHERE name ILIKE '%' || $1 || '%' OR genre ILIKE '%' || $1 || '%';