Restructure data layer (#2532)

* Add new txn manager interface
* Add txn management to sqlite
* Rename get to getByID
* Add contexts to repository methods
* Update query builders
* Add context to reader writer interfaces
* Use repository in resolver
* Tighten interfaces
* Tighten interfaces in dlna
* Tighten interfaces in match package
* Tighten interfaces in scraper package
* Tighten interfaces in scan code
* Tighten interfaces on autotag package
* Remove ReaderWriter usage
* Merge database package into sqlite

pkg/sqlite/migrations/28_images_indexes.up.sql

@@ -0,0 +1,3 @@
+DROP INDEX IF EXISTS `images_path_unique`;
+
+CREATE UNIQUE INDEX `images_path_unique` ON `images` (`path`);