FEAT #16982 TIME 11:00 WIP yousign workflow

sql/structure.sql

src/app/document/controllers/DigitalSignatureController.php

src/app/document/controllers/DocumentController.php

src/app/workflow/controllers/YousignController.php

src/app/workflow/models/WorkflowExternalInformationModel.php

src/app/workflow/models/WorkflowModel.php

src/core/models/CurlModel.php