Simplify implementation of .then() #109
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We make use of constexpr to handle the case where we need to co_await the callback and when we just want to return the result of the callback without co_awaiting it. For the optional ErrorCallback we simply provide a default one which just rethrows the current exception.
Use constexpr to handle invocation with arguments or without.
Avoid confusion with std::invoke and std::invoke_result. The new names refer to callbacks.
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