integrate with http://drupal.org/project/openai

Should probably switch to https://durpal.org/project/ai since the maintainers of https://durpal.org/project/openai have switched to maintaining https://durpal.org/project/ai as well. The use of 'openai_images' as the namespace is also problematic here though.

For example with https://www.drupal.org/project/tmgmt_openai → we made it obsolete and switched to ai namespace https://www.drupal.org/project/ai_tmgmt → in order to make it clear that it supports all major providers rather than just openai