[Feat] rtl support

[ali-garajian]

closes #17

Apparently @tanstack/virtual doesn't work well with rtl layout in scenarios where horizontal overflow occurs, as mentioned here.

In order to fix the issue, one has to provide a proper value for overscan, which is not ideal.

However this PR works well in case there's no horizontal overflow, or as said if a proper overscan value is set.

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[niikeec]

I would prefer if the @tanstack/virtual issue gets solved first, as this would cause issues whenever horizontal scroll is present. I can look into their issue in my free time.