Add proper list dropdown API for controls

[adrianthedev]

Feature

We'd love to have an API where you can add a custom list dropdown to the show|edit|index_controls feature.

list do
  link_to "google", "https://google.com", ...options
  action ...options
end

### Tasks
- [x] Add the defaults controls to the list `delete_button`, etc.

See how the block is being "read" from this PR.

Current workarounds

Add an action that has a redirect response, add that action into an actions_list and and use no_confirmation = true. It's a hack but it works.

Screenshots or screen recordings

This list. https://github.com/avo-hq/avo/issues/2775