LibSQL: Immediately commit database modifications (for now)

This ensures tables survive the database connection quitting. LibSQL
does not have transactional sessions yet, and probably won't for a
while, so let's just commit each modification as it comes.

Userland/Libraries/LibSQL/AST/Statement.cpp

@@ -14,7 +14,12 @@ namespace SQL::AST {
 ResultOr<ResultSet> Statement::execute(AK::NonnullRefPtr<Database> database) const
 {
     ExecutionContext context { move(database), this, nullptr };
-    return execute(context);
+    auto result = TRY(execute(context));
+
+    // FIXME: When transactional sessions are supported, don't auto-commit modifications.
+    TRY(context.database->commit());
+
+    return result;
 }
 
 }