Introduce new boundary parameter into LSIIR()

[BjoernLudwigPTB]

This will resolve #157 when it is merged and thus introduces a new feature. Check the according issue for details.

[codecov-commenter]

Codecov Report

Merging #161 (438e109) into master (329eb0c) will decrease coverage by 0.19%. The diff coverage is 60.00%.

@@            Coverage Diff             @@
##           master     #161      +/-   ##
==========================================
- Coverage   74.12%   73.92%   -0.20%     
==========================================
  Files          29       29              
  Lines        2191     2194       +3     
  Branches      364      365       +1     
==========================================
- Hits         1624     1622       -2     
- Misses        427      430       +3     
- Partials      140      142       +2     

Impacted Files	Coverage Δ
src/PyDynamic/model_estimation/fit_filter.py	85.29% <60.00%> (-1.51%)	:arrow_down:

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[BjoernLudwigPTB]

We closed the corresponding issue as stalled, so we can close this PR as well.