Add mactop for hardware monitoring

[metaspartan]

Updated hardware monitoring tools in the README.

Motivation

Changes

Why It Works

Test Plan

Manual Testing

Automated Testing

[Evanev7]

We may integrate mactop in future, but for now we definitely use macmon.

[metaspartan]

@Evanev7 Can't have both listed? mactop has many more features than macmon, also mactop will have thunderbolt/rdma detection support soon.

[Evanev7]

No. this isn't an endorsement of macmon, it's a dependency on macmon. We cannot simply substitute macmon for mactop and expect things to work.

Also, as the developer of mactop this feels like bad-faith advertising of your own project, not a contribution to ours.

If you wish to contribute a working PR that replaces our macmon dependency with mactop I'd gladly review it, but that is not what this PR is.

[metaspartan]

I guess I read the readme wrong, didnt see the "Pre-reqs", didn't realize you guys were using it in that way, mactop does have a programmable headless mode now though, so ya I will look into swapping over in another PR, thanks.

[Evanev7]

My apologies if that was a little blunt, we've had a lot of spam on the repo today - integrating lots of data sources is a goal for me and if mactop's rdma connectivity ends up better than shelling out to system_profiler (which is what we currently do in #928) i'd gladly integrate it myself.

[metaspartan]

No worries, it was my bad, I should learn to read better lol, yea we can probably combine all for sure, I will hopefully have you a more substantial PR soon :)