Add GPU temperature sensors

[enen92]

This adds support for GPU sensors (Kodi uses the old smctemp project to obtain either the CPU or the GPU average temperature - ref: https://github.com/xbmc/xbmc/blob/master/xbmc/platform/darwin/osx/smc.h#L36-L42 and https://github.com/xbmc/xbmc/blob/d025684d226cb88f1169bf6dfcc60d5fe4312b67/xbmc/guilib/guiinfo/SystemGUIInfo.cpp#L97C1-L104).

Implementation is pretty similar to #14 - includes both x86 and M1/M2. SMC registers where obtained from the sensors project as well.
Verified this against the values provided by TGPro:

@joshuataylor your feedback is also appreciated here
Hopefully this one can be considered as well :)

[enen92]

@narugit any strong objections against this?

[enen92]

Just tested on my old x86 mac:

➜  smctemp git:(gpu) system_profiler SPSoftwareDataType SPHardwareDataType
Software:

    System Software Overview:

      System Version: macOS 11.5.2 (20G95)
      Kernel Version: Darwin 20.6.0
      Boot Volume: Macintosh HD
      Boot Mode: Normal
      Computer Name: (redacted)
      User Name: (redacted)
      Secure Virtual Memory: Enabled
      System Integrity Protection: Disabled
      Time since boot: 4 minutes

Hardware:

    Hardware Overview:

      Model Name: MacBook Air
      Model Identifier: MacBookAir7,2
      Processor Name: Dual-Core Intel Core i7
      Processor Speed: 2,2 GHz
      Number of Processors: 1
      Total Number of Cores: 2
      L2 Cache (per Core): 256 KB
      L3 Cache: 4 MB
      Hyper-Threading Technology: Enabled
      Memory: 8 GB
      System Firmware Version: 427.140.8.0.0
      SMC Version (system): 2.27f2
      ...

➜  smctemp git:(gpu) ./smctemp -c
56.2
➜  smctemp git:(gpu) ./smctemp -g
51.0

[narugit]

Here is my mac information. In my mac, there is no information about SMC Version (system).

$ system_profiler SPSoftwareDataType SPHardwareDataType
Software:

    System Software Overview:

      System Version: macOS 12.6.3 (21G419)
      Kernel Version: Darwin 21.6.0
      Boot Volume: Macintosh HD
      Boot Mode: Normal
      Computer Name: Nac Rook Pro
      User Name: naru (naru)
      Secure Virtual Memory: Enabled
      System Integrity Protection: Enabled
      Time since boot: 10:38

Hardware:

    Hardware Overview:

      Model Name: MacBook Pro
      Model Identifier: MacBookPro15,4
      Processor Name: Quad-Core Intel Core i7
      Processor Speed: 1.7 GHz
      Number of Processors: 1
      Total Number of Cores: 4
      L2 Cache (per Core): 256 KB
      L3 Cache: 8 MB
      Hyper-Threading Technology: Enabled
      Memory: 16 GB
      System Firmware Version: 1916.80.2.0.0 (iBridge: 20.16.3045.0.0,0)
      OS Loader Version: 540.120.3~22
      Serial Number (system): ...
      Hardware UUID: ...
      Provisioning UDID: ...
      Activation Lock Status: Disabled

[narugit]

LGTM

[narugit]

@enen92
Thank you for your great work!