Add support for a notification sound upon joining

[victorpopkov]

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Is your feature request related to a problem? Please describe.

Related to #1. Sometimes it's hard to notice when the auto-joining process has been completed. It would be nice to have a some kind of notification sound upon successful joining.

Describe the solution you'd like

To have a configuration for a notification sound, so that when enabling it I could hear a sound upon successful joining.

Describe alternatives you've considered

If applicable, add a clear and concise description of any alternative solutions or features you've considered.

Additional context

If applicable, add any other context or screenshots about the feature request here.

[victorpopkov]

Notifications sound doesn't always work. Probably due to entities life-cycle during loading, as the SoundEmitter is part of the entity. So reopening this issue.