feat(persistence): add SqliteSongRepository and SqliteRepositoryFactory

crates/infrastructure/persistence/migrations/001_songs.sql

@@ -0,0 +1,9 @@
+CREATE TABLE IF NOT EXISTS songs (
+    id             TEXT PRIMARY KEY,
+    title          TEXT NOT NULL,
+    artist         TEXT NOT NULL,
+    original_key   TEXT,
+    preview_chords TEXT NOT NULL,
+    body           TEXT NOT NULL,
+    created_at     TEXT NOT NULL DEFAULT (datetime('now'))
+);