chore: add editable feature ids to votable features (#2424)

* migration to add feature ids

* use identifer as identifer name

packages/contentful/migrations/0144-add-id-to-votable-feature.cjs

@@ -0,0 +1,20 @@
+module.exports = function(migration) {
+  const voteableFeature = migration.editContentType('voteableFeature');
+
+  voteableFeature
+    .createField('identifier')
+    .name('Identifier')
+    .type('Symbol')
+    .localized(true)
+    .required(true)
+    .validations([{ size: { max: 100 },
+      message: 'Text must be max. 100 characters.' }])
+    .disabled(false)
+    .omitted(false);
+
+  voteableFeature.changeFieldControl('identifier', 'builtin', 'slugEditor', {});
+
+  voteableFeature
+    .moveField('identifier')
+    .afterField('name');
+};