Add support for processing peaks as input

[thomas-enzlein]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 78.68852% with 13 lines in your changes missing coverage. Please review.

Project coverage is 97.24%. Comparing base (dffa3d2) to head (cab942d).
Report is 10 commits behind head on main.

Files with missing lines	Patch %	Lines
R/getters.R	0.00%	4 Missing ⚠️
R/normalize.R	33.33%	4 Missing ⚠️
R/aggregateSpectra.R	95.00%	2 Missing ⚠️
R/preprocess.R	66.66%	2 Missing ⚠️
R/calculatePeakstatistics.R	66.66%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main       #7      +/-   ##
==========================================
- Coverage   98.41%   97.24%   -1.18%     
==========================================
  Files          25       25              
  Lines        1011     1051      +40     
==========================================
+ Hits          995     1022      +27     
- Misses         16       29      +13     

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