Controlling individual sector_spacing in circle_genomic plot

Hi, first of all very nice package, I think it's really useful to create complex plot integration! I am currently working on a circle genomic plot similar to the [example in the package guide](https://yunuuuu.github.io/ggalign-gallery/real-world-data/genomic-density-and-rainfall-plot.html). I would like to manually input different spacings among chromosomes, but currently providing a vector instead of a single numeric values to the parameter `sector_spacing` in `circle_genomic()` function is not supported. I think it would be useful to avoid label overlapping and to add y-axis labels to the rainfall plot annotation (just before chromosome 1 and not for all chromosomes, since they share the same limits). Would you consider adding this feature?