Add AHT20 sensor

[SoulKa]

Implemented the AHT20 environmental sensor using the SenseEnv interface. Implementation is based on this Datasheet. Tested on a RaspberryPi with the AHT20 sensor.

Features:

• Pure Go, no dependencies
• Sense() reads a single measurement
• SenseContinuous() reads measurements with the given interval into a channel (or as fast as possible if it is too small)
• Halt() stops a continuous measurement
• Options:
  • A configurable polling interval if the measurement is not finished after 80ms. Defaults to 10ms
  • A configurable measurement read timeout after the initial delay of 80ms. Default is 150ms.
  • Optionally CRC8 data validation of measurements. Default is enabled

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Comparison is base (bd7de1d) 61.6% compared to head (d998c15) 61.6%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #68 +/- ## ===================================== Coverage 61.6% 61.6% ===================================== Files 65 65 Lines 7442 7442 ===================================== Hits 4583 4583 Misses 2705 2705 Partials 154 154 ```

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[SoulKa]

Thanks for the fast reaction on this PR! I resolved your issue and the pipeline issues. Somehow, errors.Join() is not known during build. Is it not built with Go 1.20? At least that's what's written in the go.mod.

Should I add some tests using the bus mock as in bmxx80?

[maruel]

I try to keep compatibility with older version of Go since it's what is installed via apt-get install and users could be confused.