feat: implement wiki and entity repositories and services with corresponding SQL queries and generation

db/query/entities.sql

@@ -64,4 +64,7 @@ WHERE id = ANY($1::uuid[]);
 -- name: GetEntityBySlug :one
 SELECT *
 FROM entities
-WHERE slug = $1 AND is_deleted = false;
+WHERE slug = $1 AND is_deleted = false;
+
+-- name: GetEntitiesBySlugs :many
+SELECT * FROM entities WHERE slug = ANY($1::text[]) AND is_deleted = false;