Pykechain

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* :+1: Added the possibility to download, upload and reference `StoredFiles`. (1361)
* :+1: Added functions to handle `StoredFileReferenceProperty`. The behaviour is consistent to the one for the `AttachmentProperty` to facilitate conversion. (1361)
* :+1: Added python tests for 3.12. (1389)
* :+1: dependent versions for development: tox (4.12.1), flake8 (7.0.0), jsonschema (4.21.1), importlib-metadata (7.0.1), mypy (1.8.0), pytest (8.1.0), coverage (7.4.3), pre-commit (3.6.2), pytz (2024.1), pytest-xdist (3.5.0), semver (3.0.2), Pillow (10.2.0)

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* :+1: Changed the way we download pdf's from activity where we now provide the `timezone` query param in the request URL with timezone info for a more accurate determination of the display of time information in the pdf taking into account the timezone and timesystem info. For compatability sake we maintain the `offset` query param in the request to support older KE-chain backend versions.
* :+1: dependent versions for development: sphinx (7.2.6 for >= py3.9+ 7.1.2 for <= py3.8), tox (4.11.3), flake8 (6.1.0), jsonschema (4.19.0), importlib-metadata (6.8.0), mypy (1.5.1), pytest (7.4.2), pytz (2023.3.post1), nbsphinx (0.9.3)

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* :star: Added the possibility to set the list of columns and the active switch on a `ScopeReferenceProperty`. (1340)
* :+1: dependent versions for development: mypy (1.4.1), tox (4.6.3), pytest (7.4.0), pytest-cov (4.1.0), pytest-xdist (3.3.1)

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* :star: Number of tests on certain modules has been increased. (1328)
* :star: The unit of `max_size` on a `FileSizeValidator` has been changed to MB. (1328)
* :+1: dependent versions for development: tox (4.6.2), pytest (7.3.2), coverage (7.2.7), semver (3.0.1), pre-commit (3.3.3), importlib-metadata (6.6.0), pytz (2023.3), sphinx (7.0.1), nbsphinx (0.9.2), requests (2.31.0)

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* :star: Added the possibility to create, edit and delete `StoredFiles`. (1298)
* :star: Added the concept of a `StoredFilesReferenceProperty`. (1306)
* :star: Added `fileDisplay` representation for `StoredFilesReferenceProperty`. (1306)
* :+1: dependent versions for development: pre-commit (3.2.2), pytest-xdist (3.2.1), coverage (7.2.3), tox (4.4.12), mypy (1.2.0)

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* :star: Added `Signature` representation for `Attachment Property`. (1289)