Switch to using `UnsafeContinuation`s in `NIOAsyncWriter` and `NIOAsyncSequenceProducer`#2541

Draft

FranzBusch wants to merge 2 commits intoapple:mainfrom FranzBusch:fb-unsafe-continuation

+118-152

Commits on Oct 9, 2023

Call NIOAsyncWriterSinkDelegate outside of the lock
FranzBusch
committed
Switch to using UnsafeContinuations in NIOAsyncWriter and NIOAsyncSequenceProducer
FranzBusch
committed