Add a new scrolloff option to [manager] in the yazi.toml

[sxyazi]

I am posting some simple tasks here as "good first issues" that don't require too much of my attention.

I need to allocate my limited time to tasks that require my direct involvement.

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Is your feature request related to a problem? Please describe

No response

Will you be willing to contribute this feature?

• Yes, I'll give it a shot

Describe the solution you'd like

Currently its value is fixed to 5, that is, when moving the cursor in the file list, if there are fewer than 5 files below the cursor position, the list will automatically scroll. It would be great if it could be customized.

It is the same concept as scrolloff in Neovim, https://neovim.io/doc/user/options.html#'scrolloff'

Describe alternatives you've considered

No response

Additional context

No response

[dedukun]

Hey, I'll like to have a go at this one.

[github-actions]

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