Commits on Dec 14, 2021

1. Convert ScheduledTask to a struct …

   ### Motivation:
   
   In my previous PR apple#2009, I added baseline performance and allocation tests around `scheduleTask` and `execute`. After analysing, the various allocations that happen when scheduling a task there were only a few that could be optimized away potentially.
   
   ### Modifications:
   
   This PR converts the `ScheduledTask` class to a struct which will reduce the number of allocations for scheduling tasks by 1. The only thing that needs to be worked around when converting to a struct is giving it an identity so that we can implement `Equatable` conformance properly. I explored two options. First, using an `ObjectIdentifier` passed to the init. Second, using an atomic counter per EventLoop. I went with the latter since the former requires an additional allocation in the case of calling `execute`
   
   ### Result:
   
   `scheduleTask` and `execute` require one less allocation

   

   FranzBusch committed Dec 14, 2021
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