Adding yoast_seo_field_manager property to YoastSeoManager
requested to merge issue/yoast_seo-3362165:yoast_seo-3362165-3362165-deprecated-function-creation into 7.x-1.x
Based on Tom's branch, I changed the following:
- Changing the annotation of yoast_seo_field_manager to YoastSeoFieldManager
- Setting the visibility of yoast_seo_field_manager to protected