Implements a bulk send feature allowing users to upload a CSV file to
create multiple documents from a template. Includes CSV template
generation, background processing, and email notifications.
## Description
I added the option of downloading a document without the signing
certificate for teams. They can disable/enable the option in the
preferences tab.
The signing certificate can still be downloaded separately from the
`logs` page.
When signing a document the final signer is often
greeted with a super long completing spinner since
we are synchronously signing the document and sending
emails to all recipients. This is frustrating and
has caused issues for customers and self-hosters.
Moving sealing to a background job resolves this
and improves the overall snappiness of the app while
also supporting retrying the sealing if it were to
fail in the future.
This has the implication of a document no longer
immediately being in a "completed" state once all
signers have signed. To assist with this we now
refetch the page every 5 seconds upon signing
completion until the document status as shifted to
completed.
