Add new plotting feature for median normalization scale factors

[stufield]

Feature

Users would likely benefit from a simple plotting routine to plot normalization scale factors (by group).
To identify potential bias in the sample groups that might skew analyses.

R code

This would involve porting over some functionality from SomaLogic's internal code base, SomaNormalization.

plotMedNorm()

[amanda-hi]

This should be added (internally) to SomaPlot as well. When this happens, we'll need to add a lifecycle deprecation message in SomaNormalization to indicate that the function is moving to SomaPlot. In the meantime, it'll be re-exported in SomaNormalization.

Other to-do: this could be done with the ROC-plotting functions in SomaClassify as well. See #14 and #13

[stufield]

Do we need to add to SomaPlot (internal) as well? Or would the re-export from SomaNormalization be sufficient?