refactor(stores): shared escapeLike and bumpGeneration helpers

escapeLike replaces the LIKE escaping copied into PermissionStore (twice),
ShareStore and FSEntryStore, and now also guards SubdomainStore's prefix
filters, which passed caller prefixes into LIKE unescaped.

bumpGeneration sends INCR and EXPIRE in one pipeline instead of two awaited
commands in PermissionStore, EventSubscriptionStore and PresenceStore.

src/backend/util/sqlLike.ts

@@ -0,0 +1,26 @@
+/*
+ * Copyright (C) 2024-present Puter Technologies Inc.
+ *
+ * This file is part of Puter.
+ *
+ * Puter is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as published
+ * by the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+/**
+ * `value` as literal text inside a LIKE pattern, for use with `ESCAPE '!'`: `%`
+ * and `_` would otherwise widen the match. `!` rather than a backslash, which
+ * MySQL also reads as an escape inside the string literal itself.
+ */
+export const escapeLike = (value: string): string =>
+    value.replace(/[!%_]/g, '!$&');