fixup: add 100ms backoff for client-mode writes

Author: yaauie

lib/logstash/outputs/tcp.rb

@@ -181,6 +181,7 @@ def register
             written_bytes_size = client_socket.syswrite(payload)
             payload = payload.byteslice(written_bytes_size..-1)
             @logger.trace(">transmitted #{written_bytes_size} bytes; #{payload.bytesize} bytes remain", socket: @client_socket&.peer) if @logger.trace?
+            sleep 0.1 unless payload.empty?
           end
         rescue => e
           log_warn "client socket failed:", e, host: @host, port: @port, socket: client_socket&.peer