Start working on fixing interpolation for fixed edisp

[maxnoe]

@RuneDominik This is a PR targeting #250 with changes related to the interpolation code.

I started this during ICRC and will have a look now again, I don't remember quite how far I got, please have a look and maybe just push here any changes you might want to include to make it work

[codecov]

Codecov Report

Patch coverage: 99.31% and project coverage change: +0.02% 🎉

Comparison is base (8275a43) 94.74% compared to head (f4a929c) 94.76%.

Additional details and impacted files

@@                     Coverage Diff                     @@
##           fix_edisp_normalization     #251      +/-   ##
===========================================================
+ Coverage                    94.74%   94.76%   +0.02%     
===========================================================
  Files                           60       60              
  Lines                         2985     3040      +55     
===========================================================
+ Hits                          2828     2881      +53     
- Misses                         157      159       +2     

Files Changed	Coverage Δ
pyirf/interpolation/component_estimators.py	99.27% <92.85%> (-0.73%)	⬇️
pyirf/interpolation/base_interpolators.py	95.00% <94.11%> (-1.30%)	⬇️
pyirf/interpolation/base_extrapolators.py	100.00% <100.00%> (ø)
pyirf/interpolation/moment_morph_interpolator.py	100.00% <100.00%> (ø)
pyirf/interpolation/nearest_neighbor_searcher.py	100.00% <100.00%> (ø)
...yirf/interpolation/nearest_simplex_extrapolator.py	100.00% <100.00%> (ø)
pyirf/interpolation/quantile_interpolator.py	98.21% <100.00%> (+0.06%)	⬆️
...irf/interpolation/tests/test_base_extrapolators.py	100.00% <100.00%> (ø)
...irf/interpolation/tests/test_base_interpolators.py	100.00% <100.00%> (ø)
...ion/tests/test_component_estimator_base_classes.py	96.69% <100.00%> (+0.16%)	⬆️
... and 5 more

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[maxnoe]

Going on in #250