Async/Await support in Performance Testing methods

[ali-ahsan-ali]

If you have an async function it is currently not possible to test it utilising the XCTest Measure library. Even if you have no awaits as part of the async function, if the function signature is async and needs to be awaited it does not work.

Suggestion: Run the method as part of main actor, starting the measuring of what I will call block() right before execution and ending right after execution.

Assuming no other tasks are spun up inside the function being called, would this ensure that the task is run synchronously and thus performance tested? Or is there other alternatives.