add album downloading and rewrite cache

drizzle/0000_init.sql

@@ -0,0 +1,12 @@
+CREATE TABLE `file_cache` (
+	`id` integer PRIMARY KEY AUTOINCREMENT NOT NULL,
+	`name` text NOT NULL,
+	`expiry` integer NOT NULL
+);
+--> statement-breakpoint
+CREATE TABLE `key_cache` (
+	`id` integer PRIMARY KEY AUTOINCREMENT NOT NULL,
+	`songId` text NOT NULL,
+	`codec` text NOT NULL,
+	`decryptionKey` text NOT NULL
+);