Everywhere: Implement persistence of localStorage using sqlite

This change follows the pattern of our cookies persistence
implementation: the "browser" process is responsible for interacting
with the sqlite database, and WebContent communicates all storage
operations via IPC.

The new database table uses (storage_endpoint, storage_key, bottle_key)
as the primary key. This design follows concepts from the
https://storage.spec.whatwg.org/ and is intended to support reuse of the
persistence layer for other APIs (e.g., CacheStorage, IndexedDB). For
now, `storage_endpoint` is always "localStorage", `storage_key` is the
website's origin, and `bottle_key` is the name of the localStorage key.

Libraries/LibWeb/StorageAPI/StorageShelf.cpp

@@ -18,11 +18,11 @@ void StorageShelf::visit_edges(GC::Cell::Visitor& visitor)
 }
 
 // https://storage.spec.whatwg.org/#create-a-storage-shelf
-StorageShelf::StorageShelf(StorageType type)
+StorageShelf::StorageShelf(GC::Ref<Page> page, StorageKey key, StorageType type)
 {
     // 1. Let shelf be a new storage shelf.
     // 2. Set shelf’s bucket map["default"] to the result of running create a storage bucket with type.
-    m_bucket_map.set("default"_string, StorageBucket::create(heap(), type));
+    m_bucket_map.set("default"_string, StorageBucket::create(heap(), page, key, type));
     // 3. Return shelf.
 }