QC method currently in if/else block can be moved to a lookup table.

[jdpye]

Here we have an if/else block defining which method for which species:

https://github.com/ianjonsen/ArgosQC/blob/main/R/prep_diag.R#L137

This could instead be a bit of config file that we load in and check at run-time, allowing for extensions to the system without needing to change code.