make custom fields case sensitive (#1242)

* remove custom field lowercasing

* don't allow custom field form to submit duplicate field

* remove unused

* update custom field tests

* also keep upper case when editing

* show key in UI

* also kep upper case when creating a new field

* fix test

* allow old forced case keys to stay as is

* allow space

* add extension to import

* supply initial key to CustomFieldForm

* refactor: improve element contrast

* refactor: style and composition

* consistent use of `customFieldLabelToKey`

* fix CopyTag

* remove log

---------

Co-authored-by: arc-alex <ac@omnivox.dk>
Co-authored-by: Carlos Valente <carlosvalente@pm.me>

packages/utils/src/customField-utils/customFieldLabelToKey.ts

@@ -0,0 +1,12 @@
+import { isAlphanumericWithSpace } from '../regex-utils/isAlphanumeric.js';
+
+/**
+ * @description Transforms a Custom field label into a valid key or returns null if not possible
+ * @returns {string | null}
+ */
+export const customFieldLabelToKey = (label: string): string | null => {
+  if (isAlphanumericWithSpace(label)) {
+    return label.trim().replaceAll(' ', '_');
+  }
+  return null;
+};