Fix CPU / GPU temp population for macOS

[tapthaker]

Tested this by running locally on one of my Mac instances. This doesn't work for Apple Silicon yet. Still need to figure that out.

ChangeLog: Fix CPU / GPU and Ambiant temperature logging on macOS

mac@xxxxx Documents % tail /Users/mobileci/collectd/data/xxxxx/apple_sensors-ambient/temperature-2023-11-01
1698869736.548,19.582031
1698869796.539,19.570312
1698869856.540,19.554688
1698869916.549,19.472656
1698869976.541,19.699219
1698870036.536,19.542969
1698870096.544,19.636719
1698870156.546,19.531250
1698870216.539,19.675781
mac@xxxxx Documents % tail /Users/mobileci/collectd/data/xxxxx/apple_sensors-cpu/temperature-2023-11-01
1698869736.547,53.437500
1698869796.539,53.437500
1698869856.539,53.562500
1698869916.548,53.625000
1698869976.540,53.500000
1698870036.536,53.437500
1698870096.543,53.687500
1698870156.545,53.937500
1698870216.538,53.437500
1698870276.540,53.375000

Fixes #4070

[eero-t]

Um. This is more like "total conversion", rather than a fix. Because no reason is given why everything had to be changed, I'm wondering whether even a separate plugin would be more appropriate.

[octo]

Thanks for the PR @tapthaker! I think reporting of the GPU temperature is a great extension of this plugin.

This PR seems to remove a bunch of functionality, e.g. "fanspeed" reporting though, which breaks backwards compatibility. Can you reconcile the existing code and your code so all the metrics can be reported?