feat: добавил Entity Manager

src/index.ts

@@ -6,3 +6,4 @@ export { Data, ValuesObject } from './app/data'
 export { Entity, EntityConstructor, ErrEntityHasNoUniqKeyValue } from './app/entity'
 export { Repo, ErrFoundNotUniqEntity, ErrEntityNotFound } from './app/repo'
 export { Storage, StorageCursor, ErrStorage, ErrNoSession, StorageSession } from './app/storage'
+export { EntityManager } from './app/entity/manager'