Add figures showing the distribution of lengths from aged fish

[chantelwetzel-noaa]

Create a plotting function to generate length frequency figures from aged fish compared to all lengths. The lingcod assessment created figures for this analysis that should be incorporated here. @kellijohnson-NOAA Can you add the figure from the lingcod presentation and link to the code used?

[kellijohnson-NOAA]

@chantelwetzel-noaa sorry for missing the ⛵ on this one. Do you still need example figures and code used to create the figures in the lingcod stock assessment? I think this was the {ggridges} stuff, but I am not sure.

[chantelwetzel-noaa]

Thank you @kellijohnson-NOAA for adding a plotting function to view the distribution of lengths vs. the lengths of aged fish. This plotting function, plot_age_length_sample, plots simple histograms for comparison across years. This plot uses base R plotting and may be updated at some point to move to {ggplot} using {ggridges}.

[chantelwetzel-noaa]

@kellijohnson-NOAA I think we were probably editing issues at the same time and I missed that your above comment was new. I think the current function is adequate for the time being. However, I think your {ggridges} figures from lingcod last year were superior and would like to switch to that approach when time permits.