feat: add support for CPU temperature metrics on Apple Silicon

[IngmarStein]

This PR adds a new metric for temperature sensor data on Apple Silicon based Macs.

Here is an example:

# HELP node_thermal_temperature_celsius Temperature of the thermal sensor in Celsius.
# TYPE node_thermal_temperature_celsius gauge
node_thermal_temperature_celsius{sensor="NAND CH0 temp"} 32
node_thermal_temperature_celsius{sensor="PMU tcal"} 51.82000732421875
node_thermal_temperature_celsius{sensor="PMU tdie1"} 44.28541564941406
node_thermal_temperature_celsius{sensor="PMU tdie10"} 41.246978759765625
node_thermal_temperature_celsius{sensor="PMU tdie11"} 40.84718322753906
node_thermal_temperature_celsius{sensor="PMU tdie12"} 40.4473876953125
node_thermal_temperature_celsius{sensor="PMU tdie13"} 40.76722717285156
node_thermal_temperature_celsius{sensor="PMU tdie14"} 40.84718322753906
node_thermal_temperature_celsius{sensor="PMU tdie2"} 40.60731506347656
node_thermal_temperature_celsius{sensor="PMU tdie3"} 41.56681823730469
node_thermal_temperature_celsius{sensor="PMU tdie4"} 40.84718322753906
node_thermal_temperature_celsius{sensor="PMU tdie5"} 41.406890869140625
node_thermal_temperature_celsius{sensor="PMU tdie6"} 42.68623352050781
node_thermal_temperature_celsius{sensor="PMU tdie7"} 41.406890869140625
node_thermal_temperature_celsius{sensor="PMU tdie8"} 44.685211181640625
node_thermal_temperature_celsius{sensor="PMU tdie9"} 41.087066650390625
node_thermal_temperature_celsius{sensor="gas gauge battery"} 29.399993896484375