* Start of c++ callback API proposal
* More stuff
* Minor changes
* Link to core API
* yang wrote the message allocator
* Address initial reviewer comments
* Add more content to proposal
* Reviewer comment
* More reviewer comments
* Remove reference to EM
* Better use of gfm
* Post discussion link
* Note constraints and safety of streaming ops
* Take reviewer feedback.
Co-authored-by: Christopher Warrington <chwarr@microsoft.com>
* Reviewer comment fix
Co-authored-by: Christopher Warrington <chwarr@microsoft.com>
* Address reviewer comments
* Update L67-cpp-callback-api.md
* Tuning
* Address reviewer feedback
* Fix
* Short form -> Shorthand
* Last review comments
Co-authored-by: Christopher Warrington <chwarr@microsoft.com>