feat!: optimize parameters on demand by optimize flag

[jobo322]

remove the baseline option and internally rescale the y data with absolute max value to 1 in

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 100.00%. Comparing base (2c29c4e) to head (d780053).

Additional details and impacted files

@@             Coverage Diff             @@
##             main      #117      +/-   ##
===========================================
+ Coverage   95.22%   100.00%   +4.77%     
===========================================
  Files           7         9       +2     
  Lines         314       424     +110     
  Branches       62        91      +29     
===========================================
+ Hits          299       424     +125     
+ Misses         15         0      -15     

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[jobo322]

@targos, the last commit is a breaking changes and it is focus on fix an issue with the optimization of lorentzian shape parameters. do you prefer to split it into another PR?

[targos]

It would have been better to split (think about it in the future) but I can review the changes separately here.