feature request: restore last session on startup

[yashamon]

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Describe the feature

I can't find a way to configure to restore last session on startup.

Provide background

No response

What is the significance of this feature?

nice to have

Additional details

It would be good to have the following behavior: if no running neovim instance exists, then restore last session on startup. If an instance does exist, then just open neovim without loading any sessions.

Alternatively, always restore the session that was last terminated.