Review com.arjuna.ats.arjuna.coordinator.ActionManager. In particular:

• Remove the `getTimeAdded` method (which was deprecated a long time ago)
• As a consequence of the previous point, the `Lifetime` class can be deprecated/removed (as it is an internal class, I vote for removing it)
• Remove the `final` keyword from the static method `manager`
• `_allActions` doesn't need to be static (as ActionManager is Singleton)
• Reformat the whole ActionManager class (if it is preferred a dedicated JBTM for this point, please create a subtask within this issue tracker)

Reason to review this class: `ActionManager.getTimeAdded` has been deprecated for a long time and we should take the next step we already announced (i.e. remove it). As the Lifetime class is an internal class and it is only used in `getTimeAdded`, we should also remove that class and simplify the Map that use it