Allow a new set of signatures on the same original document

Is your feature request related to a problem? Please describe.
I created a test PDF Test signature.pdf for userA to sign, once signed, a new file Test signature.signed.pdf was created. Let's say this is a code of conduct or something.

A week later, I need userB to read and sign that document, but I need a separate "signed" pdf.

If I want another person to sign the same document (ie: code of conduct), I would need to copy the original file I'm guessing and now for two signatures I have 4 files.

Describe the solution you'd like
On the sidebar:

For the original document:

Show who requested the signature of that document and if/when it was signed for each "batch"

Admin on .... requested a signature to: userA, userD
userA signed on ....
userD signed on...

Add a button, "request new signatures" that will use the same predefined signing area, but we can set who needs to sign where

Describe alternatives you've considered
Right now I need to copy the original PDF so LibreSign sidebar allows for another set of signatures.

Additional context
Clear confusion between signed and unsigned file

Start by reviewing the sidebar flow for original and signed PDFs, including the confusion referenced in issue #4160. Trace how the current signing area and signature request are associated with a copied document, then define the design for multiple signature batches on one original; done means new recipients can sign the same predefined areas while each batch has separate status and signed output.