[Pitch#2] send and @oneway method calls

This pitch supersedes what used to be a distributed-only feature, discussed over here: [Pitch] Distributed RemoteCall Semantics As we explored the design, we realized there is a bigger need in general Swift and Actors we needed to address here. So this proposal now generalizes to all actor calls, please continue reading for all the nitty gritty details 🙂 This proposal introduces the send expression and @oneway function marker. This marker does not introduce a new function color,...