fix: Move collection index validation logic to a context assert function (#2116)

* Abstract validation logic for readability

* Add index validation in collections.move

* Add tests

shared/utils/indexCharacters.js

@@ -0,0 +1,4 @@
+// @flow
+
+export const validateIndexCharacters = (index: string) =>
+  /^[\x21-\x7E]+$/i.test(index);