feat: add gap option to allow you to set the gap between items

[gronxb]

Motivation

Virtual lists operate on an absolute positioning basis, meaning that traditional list styling like marginBottom or marginTop doesn't work as expected. These styles require manual adjustment for proper spacing between items. Therefore, by introducing the gap option, we provide a convenient way to easily set spacing within the list.

2024-03-17.3.42.54.mov

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[piecyk]

Yeah let's merge it, saw a request for this few times already. Thank you for your contribution!