[Action] Docusign - Download Envelope Documents

[malexanderlim]

This request is to add a new action called Download Envelope Documents.

The prop should enable the end-user to download envelope documents to /tmp by returning a documents object with a fileUrl path to /tmp.
https://developers.docusign.com/docs/esign-rest-api/how-to/download-envelope-documents/

Download options:

• All Documents (PDF)
• All Documents (Zip)
• Certificate (PDF)
• Portfolio (PDF)

The document ID specifies the document or documents that you want to download. You can use the document ID itself or one of the following keywords.
combined: Retrieves a PDF file that contains the combined content of all of the documents. If the account option Attach certification of completion to envelope is on, then the Certificate of Completion is also included in the PDF file. You set this account option in the Admin tool on the Signing Settings screen, or by setting the attachCompletedEnvelope property in the accountSettings object to true.
archive: Retrieves a ZIP archive that contains all of the PDF documents and the Certificate of Completion.
certificate: Retrieves the Certificate of Completion as a PDF file.
portfolio: Retrieves the envelope documents as a PDF portfolio.

Here is an example of how another competitive product handles this for reference - I think that the way we present this will offer additional functionality over this.