Add the option to run /save-all before server shutdown and after server shutdown announcement

[joeyak]

Enhancement Type

Improve an existing feature

Describe the enhancement

Add an option to save the world before server shutdown. I ran into a situation where someone lost some items because the server restarted and they put iron in a chest, but after the restart, the chest didn't have the iron and the player didn't have it in their inventory. This is because the server saves at a different interval than entities.

[itzg]

When the container stops normally then a graceful stop of the server is initiated. Your container must have been terminated abnormally. Watch the logs during a start and you'll see the progression of normal saves and shutdown.

[github-actions]

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