Implement resumable downloads

[sfmskywalker]

This PR adds the ability to resume interrupted downloads.

If the file is a zip file that was generated on the fly, it will be cached (when enabled), allowing the client to download parts of the zip file.

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Summary
This pull request introduces changes to the Elsa workflow providers that enable stronger abstraction for working with blobs in the workflow persistence engine. These changes include renaming some classes and methods, changing some method parameters and return types, and adding error handling checks. Suggested refactoring includes moving code to shared helper methods, renaming endpoint classes, moving methods to the Configure method in the ElsaEndpoint class, and adding validation for parameters in the Execute endpoint.