Feature request: Could label_* functions support labelling every nth break?

[davidhodge931]

This is useful, as it provides another way to get the breaks & labels you want - and it can work well depending on the theme used.

I think it'd be ideal if this could be expressed as an argument every_nth argument in each label_* function.

This would then provide a way for the user to then determine the the frequency of labels (e.g. provide a label every 2nd break), and an offset (to start at not the first break if desired).

This is following on from this discussion here tidyverse/ggplot2#5881

[davidhodge931]

An example of a situation where this is useful..

A plot of monthly cases, where you want to demonstrate that it is monthly on the x axis using monthly minor breaks.

..But labelling every year does not fit for the size of image that you want to make. It works nice to label every 2nd break in this case