use actual macos memory usage from libproc pid_rusage

[forivall]

I'd also like to add a column to show the raw bytes from ri_phys_footprint, but i'm not sure if i should create a new column or which existing column to use (I'm thinking of making a new VmTotal or VmPss column, which could be calculated appropriately for other operating systems)

[dalance]

I agree to add VmTotal column.

I update MSRV to fix MSRV CI failure.
So could you fix other CI failures and add VmTotal column to README.md?

[forivall]

i accidentally had a few extra commits which added support for the Env on macos - those commits had the clippy issues, as it had a quick hack to display env in json, but only in macos, due to env vars including ansi escapes (specifically LESS_TERMCAP_*, which customizes manpage colors) (honestly, the env should be formatted and escaped for all platforms, but that's a different discussion). I've moved them into another branch which i'll submit independently as a different PR.

also i think the MSRV needs to be bumped to 1.82 due to this dep update of byte-unit #841