Proposal (4.0): Inline global preparations into actions at compile time

[sevenseacat]

Is your feature request related to a problem? Please describe.

We ran into an issue where we were loading data in a preparation for a default read action, which caused other issues, but we weren't getting the new warning advising not to do that (introduced in e5656b6).

The reason is because the preparation was a global one, ie. in a preparations block, not in a specific action. These preparations aren't inlined into the action at compile time, meaning calling Ash.Resource.Info.action(MyResource, :read) won't list the preparation even though it will apply.

Describe the solution you'd like

These preparations should be added to each of the actions they apply to, at compile time. For now this will be all actions, as preparations can't have conditions, but later on conditions may be added.