Add annotation-reading code

[Hneuschmidt]

Adds a function read_annotations to NotebookParameters to extract type annotations from the parameter code.
This could enable annotating EO product inputs (i.e., those that are shown as Directory in the CWL and should contain a catalog.json) by adding a specific annotation like my_input: "EoInput" to the notebook parameters.

Closes #91 .

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 97.71%. Comparing base (502c440) to head (0c20079).

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #88      +/-   ##
==========================================
+ Coverage   97.69%   97.71%   +0.01%     
==========================================
  Files           6        6              
  Lines         608      612       +4     
  Branches       66       66              
==========================================
+ Hits          594      598       +4     
  Misses          9        9              
  Partials        5        5              

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