Refactor and cleanup custom input BO implementation

[codecov[bot]]

Codecov Report

Merging #26 (7cff51d) into main (92db7b5) will increase coverage by 0.05%. The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main      #26      +/-   ##
==========================================
+ Coverage   89.73%   89.78%   +0.05%     
==========================================
  Files          53       53              
  Lines        2084     2076       -8     
==========================================
- Hits         1870     1864       -6     
+ Misses        214      212       -2     

Flag	Coverage Δ
unittests	89.78% <100.00%> (+0.05%)	:arrow_up:

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Impacted Files	Coverage Δ
gutenTAG/utils/global_variables.py	100.00% <ø> (ø)
gutenTAG/base_oscillations/custom_input.py	100.00% <100.00%> (+5.40%)	:arrow_up:
gutenTAG/base_oscillations/interface.py	94.20% <100.00%> (ø)

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[CodeLionX]

Merging without review to accelerate the release process.