ism330dl: Add two-point temperature calibration methods.

[nedseb]

Context

Part of the temperature calibration harmonization (#103).

The ISM330DL has an embedded temperature sensor. Like the LIS2MDL, the raw reading has no guaranteed absolute zero point. A two-point software calibration mechanism is needed, consistent with the harmonized interface defined in #103.

Blocked by #50 (ISM330DL driver not yet merged).

TODO

• Add self._temp_gain = 1.0 and self._temp_offset = 25.0 in __init__ (empirical default)
• Add set_temp_offset(self, offset_c) method (simple offset, gain=1.0)
• Add calibrate_temperature(self, ref_low, measured_low, ref_high, measured_high) method
• Apply calibration in temperature method: return self._temp_gain * raw_value + self._temp_offset

Related

• drivers: Harmonize two-point temperature calibration across all sensors. #103 — Parent: harmonize temperature calibration
• ism330dl: Add ism330dl driver. #50 — ISM330DL driver (prerequisite)

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