grpc-js: Preserve order of metadata, messages, and call end with async interceptors #1986
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The code already existed to ensure that the status/halfClose comes after the last message when interceptors do async processing. This change extends that to ensure that metadata is processed before both of those.
I also added handling for a call trying to output a status before the
startmethod is called. Now the status waits for that, instead of getting sent into the void.This fixes #1984 and #1985.