Introduces driver for Sensirion SHT-4X Temperature/Humidity Sensors

[gsexton]

Also moves CRC8 logic into common package for re-usability across multiple packages.

[codecov]

Codecov Report

Attention: Patch coverage is 78.03468% with 38 lines in your changes missing coverage. Please review.

Project coverage is 52.9%. Comparing base (f009056) to head (8a85f99).
Report is 4 commits behind head on main.

Files with missing lines	Patch %	Lines
sht4x/sht4x.go	78.3%	25 Missing and 8 partials ⚠️
hdc302x/hdc302x.go	37.5%	0 Missing and 5 partials ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##            main    #109     +/-   ##
=======================================
+ Coverage   52.4%   52.9%   +0.5%     
=======================================
  Files        113     116      +3     
  Lines      14226   14617    +391     
=======================================
+ Hits        7455    7727    +272     
- Misses      6425    6526    +101     
- Partials     346     364     +18     

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[maruel]

Thanks!

I'm not super enthusiast with the package name "common" but I don't have a good suggestion readily available so it's fine.