split up table creation SQL into separate files

lib-sql/tables/entrance.sql

@@ -0,0 +1,20 @@
+-- SPDX-License-Identifier: GPL-2.0-only
+--
+-- This file is part of Nominatim. (https://nominatim.org)
+--
+-- Copyright (C) 2026 by the Nominatim developer community.
+-- For a full list of authors see the git log.
+
+-- Table to store location of entrance nodes
+DROP TABLE IF EXISTS placex_entrance;
+
+CREATE TABLE placex_entrance (
+  place_id BIGINT NOT NULL,
+  osm_id BIGINT NOT NULL,
+  type TEXT NOT NULL,
+  location GEOMETRY(Point, 4326) NOT NULL,
+  extratags HSTORE
+  );
+
+CREATE UNIQUE INDEX idx_placex_entrance_place_id_osm_id ON placex_entrance
+  USING BTREE (place_id, osm_id) {{db.tablespace.search_index}};