Test speed improvements of disabling struckture checks of Argu

[kMutagene]

https://fsprojects.github.io/Argu/perf.html

Since the cli arg union case tree i pretty large in this repo, it might be worth to investigate the possible performance gains of disabling structure checks in the releases (maybe move structure checking to unit tests alltogether as well)

[omaus]

Sounds nice, will investigate this in the near future.