Create a .aosrc file to set flags for common tools

[brian-griglak]

I frequently use flags like --pretty in calls to aos_dump and log_cat. It would be nice if we could create a resource file that associated flags we always want on with tools like this, similar to how .bazelrc lets you add flags you always want on for build or run commands.
I don't know what the syntax would be if you make a flag like --pretty always on in the rc file, and then want to turn it off on occasional calls. Maybe a --nopretty on the command line overrides the rc file?

[AustinSchuh]

That's an interesting thought. Absl flags have ways from reading flags from files and from environmental variables. I wonder how close that gets us, or if something additional would help.