Draft: Slicing

[JonasIsensee]

Implements a dataset wrapper ArrayDataset that allows typestable slicing and update of array datasets using the getindex and setindex! API.

[codecov]

Codecov Report

Attention: Patch coverage is 94.33962% with 3 lines in your changes missing coverage. Please review.

Project coverage is 85.26%. Comparing base (8b6dbbc) to head (5d592ea).
Report is 5 commits behind head on dev.

Files with missing lines	Patch %	Lines
src/data/reconstructing_datatypes.jl	92.30%	1 Missing ⚠️
src/datasets.jl	85.71%	1 Missing ⚠️
src/explicit_datasets.jl	96.66%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##              dev     #589      +/-   ##
==========================================
+ Coverage   85.04%   85.26%   +0.21%     
==========================================
  Files          36       36              
  Lines        4434     4438       +4     
==========================================
+ Hits         3771     3784      +13     
+ Misses        663      654       -9     

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