[Feature] ppg_peaks() now has artifact correction

[DominiqueMakowski]

• Added fixpeaks as part of ppg_peaks() routine. Should we enable it as default in ppg_process? Needs some testing

[codecov-commenter]

Codecov Report

Patch coverage: 58.97% and project coverage change: -0.02% ⚠️

Comparison is base (4bf8071) 55.18% compared to head (781ebd6) 55.17%.

Additional details and impacted files

@@            Coverage Diff             @@
##              dev     #890      +/-   ##
==========================================
- Coverage   55.18%   55.17%   -0.02%     
==========================================
  Files         302      302              
  Lines       14103    14134      +31     
==========================================
+ Hits         7783     7798      +15     
- Misses       6320     6336      +16     

Files Changed	Coverage Δ
neurokit2/ecg/ecg_segment.py	90.38% <50.00%> (-1.62%)	⬇️
neurokit2/ppg/ppg_segment.py	80.00% <50.00%> (-3.34%)	⬇️
neurokit2/ecg/ecg_peaks.py	80.30% <52.94%> (-9.50%)	⬇️
neurokit2/ecg/ecg_plot.py	88.46% <66.66%> (+0.96%)	⬆️
neurokit2/ppg/ppg_peaks.py	78.78% <66.66%> (-10.11%)	⬇️
neurokit2/ppg/ppg_plot.py	50.00% <66.66%> (+2.17%)	⬆️

... and 1 file with indirect coverage changes

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