Add migrations for device sync

cmd/migrations/000002_add_device_sync.down.sql

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+DROP TABLE device_sync_groups;
+DROP TABLE device_sync_group_devices;

cmd/migrations/000002_add_device_sync.up.sql

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+CREATE TABLE 'device_sync_groups' (
+  id INTEGER PRIMARY KEY AUTOINCREMENT,
+  sync_status VARCHAR(20) NOT NULL DEFAULT 'pending',
+  sync_time TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP,
+  created_at varchar(255),
+  updated_at varchar(255)
+);
+
+CREATE TABLE 'device_sync_group_devices' (
+  device_sync_group_id INT NOT NULL REFERENCES device_sync_group(id),
+  device_id INT NOT NULL REFERENCES devices(id),
+  PRIMARY KEY (device_sync_group_id, device_id)
+);

cmd/migrations/000003_update_devices_for_uniqueness.down.sql

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+DROP INDEX IF EXISTS unique_user_id_and_device_name_index;

cmd/migrations/000003_update_devices_for_uniqueness.up.sql

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+CREATE UNIQUE INDEX unique_user_id_and_device_name_index ON devices(user_id, name);