Pykechain

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* :star: Add the possibility to add a prefilter option to the context reference property. It will be stored in the prefilter section of the value options of a the reference property.
* :star: We added support for the Markdown Widget in pykechain. (1499)
* :+1: When the multi-attachment property (`StoredFilesReferencesProperty`) is configured to only take a single 'reference' using a `SingleReferenceValidator`, then an upload to this property should replace the value instead of append the value. (1500)

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* :star: We added a `json_load()` method on the `StoredFile` to be compatible with the same interface as the attachment property. (1485)

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* :star: We added the concept of the `Signature` property. With this property we handle signature's better and more explicit in KE-chain. Signatures are stored as `StoredFiles` in the backend. (1467)

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* :star: Added the option not to include PDF's inline inside the PDF. The PDF will return a zip with the PDF and all attachments that cannot be put inline inside an attachment folder. (1448)
* :+1: Also accept a 202 Accepted HTTP response for the scope clone and improved API error handling.(1459)

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* :+1: We've refactored the way we handle the retrieval of descendants of a `Part`, by properly targeting the root to be removed from the list. (1444)
* :star: Added the multiattachment viewer widget to the codebase in alignment with KE-chain-2 backend. (1434)
* :+1: We included Deprecation warnings when the developer is using Progress widgets in their scripts to inform them that Progress widgets are deprecated from June 2024 onwards. Later we will remove this function completely. (1445)
* :+1: dependent versions for development

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* :+1: Added the `ShowScopeMembersOnly` representation on the `UserReferenceProperty`. (1418)
* :+1: We upgraded the available python versions for service execution python scripts to 3.12 (default) or python 3.9 (legacy). We deprecated the functionality to work with python notebooks. (KE-4413)
* :+1: dependent versions for development