Add pretty printing for OrderedDictWrapper and check for Catalog type in construction

[felixcremer]

This adds a check for the type key in the Catalog construction if it is available.
This also adds a pretty printing for OrderedDictWrapper to make it lazy.

I also added a function to get the search url because this should be provided as an entry in the JSON file with some metadata.

For the Catalog check we test whether the type key is available because according to #22 (comment) this is not always provided.

[felixcremer]

This would close #24

[codecov]

Codecov Report

❌ Patch coverage is 88.88889% with 4 lines in your changes missing coverage. Please review.
✅ Project coverage is 75.77%. Comparing base (411db70) to head (1d6519d).
⚠️ Report is 14 commits behind head on main.

Files with missing lines	Patch %	Lines
src/utils.jl	84.21%	3 Missing ⚠️
src/catalog.jl	80.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #26      +/-   ##
==========================================
+ Coverage   73.07%   75.77%   +2.69%     
==========================================
  Files           9        9              
  Lines         286      322      +36     
==========================================
+ Hits          209      244      +35     
- Misses         77       78       +1     

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[Alexander-Barth]

Thanks a lot Felix!