Create playlist database migration

migrations/2024-10-22-212759_create_playlist_tables/up.sql

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+CREATE TABLE playlists (
+    id SERIAL PRIMARY KEY,
+    created_at TIMESTAMP NOT NULL DEFAULT NOW(),
+    updated_at TIMESTAMP NOT NULL DEFAULT NOW(),
+    owner_id INTEGER REFERENCES users(id) ON DELETE CASCADE NOT NULL,
+    name TEXT NOT NULL
+);
+
+CREATE INDEX playlists_owner_idx ON playlists(owner_id);
+
+CREATE TABLE playlist_songs (
+    playlist_id INTEGER REFERENCES playlists(id) ON DELETE CASCADE NOT NULL,
+    song_id INTEGER REFERENCES songs(id) ON DELETE CASCADE NOT NULL,
+    PRIMARY KEY (playlist_id, song_id)
+);
+
+CREATE INDEX playlist_songs_playlist_idx ON playlist_songs(playlist_id);