feat: add recipient roles (#716)

Fixes #705

---------

Co-authored-by: Lucas Smith <me@lucasjamessmith.me>
Co-authored-by: David Nguyen <davidngu28@gmail.com>

packages/trpc/server/recipient-router/schema.ts

@@ -1,5 +1,7 @@
 import { z } from 'zod';
 
+import { RecipientRole } from '@documenso/prisma/client';
+
 export const ZAddSignersMutationSchema = z
   .object({
     documentId: z.number(),
@@ -8,6 +10,7 @@ export const ZAddSignersMutationSchema = z
         nativeId: z.number().optional(),
         email: z.string().email().min(1),
         name: z.string(),
+        role: z.nativeEnum(RecipientRole),
       }),
     ),
   })