`gpnf-map-child-entries-to-acf-repeater-field.php`: Fixed an issue with nested form field data not displaying on ACF field.

[saifsultanc]

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Context

⛑️ Ticket(s): https://secure.helpscout.net/conversation/2438225719/58343?folderId=7098280

Summary

When the parent form is submitted, a post is created with the Advanced Post Creation add-on. The Nested Form entries should be linked to the targetted repeater field in the created post, but they don't work. This is down to the asynchronous behavior of Gravity Forms Advanced Post Creation Add-on v1.4.0 (changelog). Disabling async does resolve the issue.

Also, the snippet is converted to a class-based snippet for easy management by the end user.