text: Title: [Tech debt] Update interface for RandomRain
  Body: Right now in the transform we have separate parameters for `slant_lower` and `slant_upper`
  
  Better would be to have one parameter `slant_range = [slant_lower, slant_upper]`
  
  =>
  
  We can update transform to use new signature, keep old as working, but mark as deprecated.
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  PR could be similar to https://github.com/albumentations-team/albumentations/pull/1704