Implement import extraction for notebooks in Rust

[fpgmaas]

PR Checklist

• A description of the changes is added to the description of this PR.
• If there is a related issue, make sure it is linked to this PR.
• If you've fixed a bug or added code that should be tested, add tests!
• Documentation in docs is updated

Description of changes

• Currently, we extract imports from .py files in Rust, and .ipynb files in Python. This moves the functionality for ipynb files to Rust too.
• It introduces a src/imports directory, with shared functionality in shared.rs
• Introduces the use of type aliasses:

  pub type FileToImportsMap = HashMap<String, Vec<Location>>;
  pub type ErrorList = Vec<(String, PyErr)>;

• Removes the functions get_imports_from_py_file since it was not used.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 90.6%. Comparing base (6c73675) to head (818722e).

Additional details and impacted files

@@           Coverage Diff           @@
##            main    #606     +/-   ##
=======================================
- Coverage   90.7%   90.6%   -0.2%     
=======================================
  Files         38      35      -3     
  Lines       1086    1011     -75     
  Branches     224     205     -19     
=======================================
- Hits         986     916     -70     
+ Misses        85      81      -4     
+ Partials      15      14      -1     

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