Add User wish list settings

This functionality specifically allows the user to implement certain modifications for any specific wishlist.

Implementation steps involved:

1. This feature is implemented by creating a table for the required wish list settings using the Form and Database APIs.
2. The mandatory fields, including User, Title, Expiration Date & Status are created using Field API and the Hook functions hook_field_settings_form & hook_field_widget_form. The Configuration API would be used to configure the fields.
3. db_select is implemented with a Join to join/combine with another table containing relevant information.
4. The Renderable Array system would be applied to improve the grouping of the contents. The Field Theme System would be configured.