grpc-js: Stop leaking freed message buffer placeholder objects #2372
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This fixes #2371. Currently, in a retrying call, when a message that has been sent is no longer needed, its entry in the message buffer is replaced with a placeholder entry with
entryType="FREED". This frees up the memory of the actual message contents, but in a long-running stream, the placeholder entries themselves can pile up and start to use a significant amount of memory.With this change, the message buffer only contains the range of messages that still need to be sent, and the new
writeBufferOffsetfield indicates the offset the buffer has from the beginning of the message stream. The code still tracks message indices relative to the start of the message stream, because that can always just be incremented without any concern for the current state of the buffer.