feature request: options disable preview for large files

[Bekaboo]

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Describe the feature

Add an option, e.g. max_preview_size so that preview is not enabled for files that exceeds the limit

Provide background

I frequently have preview enabled on the right side of oil buffer and just moves the cursor down to skim through a directory. In most cases this works fine, but occasionally there are large files in the directory and previewing them make the current nvim session freeze.

Additional details

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