Show capabilities of auxargs

[InterestedInTechAndCake]

From @brooksdavis :
It occurs to me that we could get more information about argument, etc capabilities by reading ps_strings or elf auxargs in chericat. I started to suggest reading ps_strings via kern.proc.KERN_PROC_PS_STRINGS.<pid>, but it is probably better to use kern.proc.KERN_PROC_AUXV.<pid> and chase pointers from there since that’s how _start() does it.

[brooksdavis]

CTSRD-CHERI/cheribsd#1890 adds support for printing capabilities in auxv and might be inspirational.