[WIP] BinningAlgorithms

[Cornelius-G]

WIP

• need to add a bit more support for NamedTuples
• need to do some minor adaptions & clean-up
• @oschulz: I did not (yet) add a FixedBinning type since I actually wanted the binning to accept Integerand Ranges directly without wrapping into a special type, so that e.g. plot(samples, bins=(50, -10:0.5:10, SqrtBinning()) is possible (which it is now).
  So currently we accept something like (tuples of) Union{Integer, AbstractRange, AbstractBinning}.
  In Add BinningAlgorithm algo type #166 you mentioned Base.convert could be helpful, but it seems I do not fully understand how this would improve the usability, so maybe you could explain how we should handle this.

[codecov-commenter]

Codecov Report

❌ Patch coverage is 0% with 65 lines in your changes missing coverage. Please review.
✅ Project coverage is 44.43%. Comparing base (f5342a8) to head (9957479).
⚠️ Report is 705 commits behind head on main.

Files with missing lines	Patch %	Lines
src/algotypes/binning_algorithm.jl	0.00%	56 Missing ⚠️
src/plotting/MarginalDist.jl	0.00%	6 Missing ⚠️
src/optimization/mode_estimators.jl	0.00%	3 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #169      +/-   ##
==========================================
- Coverage   45.06%   44.43%   -0.63%     
==========================================
  Files          89       90       +1     
  Lines        4613     4658      +45     
==========================================
- Hits         2079     2070       -9     
- Misses       2534     2588      +54     

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