feat: add validation before creating session

server/src/api/validators/sessionValidator.js

@@ -0,0 +1,8 @@
+import { check } from 'express-validator'
+import { noError } from '../../middleware/validator.js'
+
+const checkQuestId = () =>
+  check('quest_id').notEmpty().isString().isLowercase().isLength({ max: 64 })
+
+export const createSessionValidator = [checkQuestId(), noError]
+export const activeSessionValidator = [checkQuestId(), noError]