Add JSON details

[mmaelicke]

@AlexDo1 this PR will add my latest changes to the Detail model to your branch. This way we can make sure that your changes and my changes are not interfering before we merge into master

[mmaelicke]

@AlexDo1 you can merge, whenever you are ready to include my changes into your branch

[codecov[bot]]

Codecov Report

Merging #127 (3133451) into array_type_datatable (b9fa485) will increase coverage by 1.42%. The diff coverage is 79.25%.

@@                   Coverage Diff                    @@
##           array_type_datatable     #127      +/-   ##
========================================================
+ Coverage                 56.10%   57.53%   +1.42%     
========================================================
  Files                        57       59       +2     
  Lines                      2588     2715     +127     
========================================================
+ Hits                       1452     1562     +110     
- Misses                     1136     1153      +17     

Flag	Coverage Δ
e2e	57.53% <79.25%> (+1.42%)	:arrow_up:

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
metacatalog/db/revisions/__init__.py	100.00% <ø> (ø)
metacatalog/db/revisions/rev5.py	60.00% <60.00%> (ø)
metacatalog/util/results.py	73.17% <73.17%> (ø)
metacatalog/models/entry.py	72.22% <88.88%> (+2.26%)	:arrow_up:
metacatalog/api/find.py	53.44% <91.66%> (+3.09%)	:arrow_up:
metacatalog/__init__.py	100.00% <100.00%> (ø)
metacatalog/models/details.py	97.77% <100.00%> (+1.77%)	:arrow_up:

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