Defer loading action fields (primarily of inline actions)

[sanderbaas]

In issue #3598 the following desired behaviour was requested: 'Fields of inline and detail actions should only be instanced after triggering the action itself.'.

Looking at the tags of this issue, this behaviour may have been implemented, but it is unclear.

It seems inline functions are still being resolved when the resources are loaded on the index. Is there a way to defer resolving the fields until the action is triggered?