[Distributed] Resolving distributed actor protocols (#2277)

* Initial revision draft

* rework proposal in terms of macros

* cleanups

* revise design to use generic distributed actors

* formatting

* fix typo in code snippet

* update pitch link

* minor cleanup

* Update proposals/NNNN-resolve-distributed-actor-protocols.md

* Apply suggestions from code review

Co-authored-by: Frederick Kellison-Linn <[email protected]>

* distributed actor protocols is SE-0428

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Co-authored-by: Frederick Kellison-Linn <[email protected]>
Co-authored-by: Freddy Kellison-Linn <[email protected]>

Author: ktoso