mpu9250: Add i2c interface support

[gsexton]

Implements #23

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 96 lines in your changes missing coverage. Please review.

Project coverage is 52.3%. Comparing base (ea55a05) to head (ec8bba8).
Report is 2 commits behind head on main.

Files with missing lines	Patch %	Lines
mpu9250/transport.go	0.0%	95 Missing ⚠️
mpu9250/mpu9250.go	0.0%	1 Missing ⚠️

❌ Your patch status has failed because the patch coverage (0.0%) is below the target coverage (40.0%). You can increase the patch coverage or adjust the target coverage.

Additional details and impacted files

@@           Coverage Diff           @@
##            main    #101     +/-   ##
=======================================
+ Coverage   51.7%   52.3%   +0.5%     
=======================================
  Files        106     109      +3     
  Lines      13512   13864    +352     
=======================================
+ Hits        6991    7246    +255     
- Misses      6222    6297     +75     
- Partials     299     321     +22     

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[maruel]

Side note: we should probably standardize on the log/slog package. It's actually pretty good.