Add draft of 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.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 97.68%. Comparing base (dd62a0b) to head (8da37e0).

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #88      +/-   ##
==========================================
+ Coverage   97.64%   97.68%   +0.03%     
==========================================
  Files           6        6              
  Lines         595      605      +10     
  Branches       66       68       +2     
==========================================
+ Hits          581      591      +10     
  Misses          9        9              
  Partials        5        5              

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