Increase API call page size for getForms()

@andresgmh, thanks. This looks like a useful feature.

A few requests:

1. If you are still updating your code, please assign yourself this task.
2. Since Drupal is moving to Merge Requests on Gitlab, would you mind opening one instead of using patches? It's not a requirement, but it makes reviewing much easier.
3. This module needs test coverage. Ideally, we would have tests to make sure this new feature doesn't cause regressions, but at a minimum we should test to confirm this feature is working.

@andresgmh, thanks for the new patch, but a merge request will be easier to review and collaborate on. At a minimum, please provide an interdiff, https://www.drupal.org/docs/develop/git/using-git-to-contribute-to-drupa... → , for your new patch. Thanks.