Document how to size the direct memory under expected event size#476

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andsel wants to merge 3 commits intologstash-plugins:mainfrom

andsel:fix/describe_how_to_size_direct_memory

Commits on Sep 25, 2023

First draft to describe how to size the native memory used by Beats input to decode a batch of events.
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Minor, fixed number of Netty event loop threads count
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Fixed description, is not the number of Netty event loops that determine how many batch in flight we have, but the number of connected channels.
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