Add sar adc

[fronzbot]

Adds a SAR ADC model as well as a tone generation method

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 17.74194% with 51 lines in your changes missing coverage. Please review.

Project coverage is 60.32%. Comparing base (7b189ad) to head (ef5ec58).

Files with missing lines	Patch %	Lines
adc_eval/adcs/sar.py	0.00%	49 Missing ⚠️
adc_eval/adcs/basic.py	0.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##              dev     #108      +/-   ##
==========================================
- Coverage   67.11%   60.32%   -6.80%     
==========================================
  Files           5        6       +1     
  Lines         371      431      +60     
==========================================
+ Hits          249      260      +11     
- Misses        122      171      +49     

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