Add first_name & last_name to user object fields

[JoryHogeveen]

Fixes: #1890
Related: #4041

Changelog text for these changes

Checklist:

• My code is tested.
• My code follows the WordPress code style.
• My code follows has proper inline documentation.
• My code includes PHP Unit Tests (if applicable)

[tr1b0t]

🚫 4 error(s)
⚠️ 2 warning(s)

[sc0ttkclark]

Probably needs some testing coverage to confirm this works as expected since they aren't object table (wp_users) fields but they're meta (wp_usermeta) fields.

[JoryHogeveen]

@sc0ttkclark I assumed this wouldn't be an issue since menu_order is also included as an object field while it's saved as post metadata.

[sc0ttkclark]

menu_order is a wp_posts table field though

[JoryHogeveen]

Oh wow, I was 100% sure that it was a meta field.
In that case, what are possible issues that could rise by adding these fields as object fields? In WP core the fields are labels as User object fields..

[JoryHogeveen]

@sc0ttkclark Bump:

In that case, what are possible issues that could rise by adding these fields as object fields? In WP core the fields are labels as User object fields..

[sc0ttkclark]

@JoryHogeveen the problem with object fields is that they are treated specially during saving of the object data, querying, traversal, and other functionality throughout Pods.

[sc0ttkclark]

I'd like to see us be able to supply special meta-based object fields which get set up as normal Field objects instead of Object_Field in 2.8. This may be easier to do post 2.8