feat: add weight adjustment for signal zones in airPLS algorithm

[jobo322]

No description provided.

[codecov]

Codecov Report

❌ Patch coverage is 91.85185% with 11 lines in your changes missing coverage. Please review.
⚠️ Please upload report for BASE (main@082d737). Learn more about missing BASE report.

Files with missing lines	Patch %	Lines
src/index.ts	85.50%	9 Missing and 1 partial ⚠️
src/utils.ts	96.42%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #15   +/-   ##
=======================================
  Coverage        ?   92.17%           
=======================================
  Files           ?        3           
  Lines           ?      230           
  Branches        ?       29           
=======================================
  Hits            ?      212           
  Misses          ?       17           
  Partials        ?        1           

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[lpatiny]

Missing https://github.com/mljs/spectra-processing/blob/main/src/.npmignore

Otherwise it is ok for me.