feat: send custom email to signers of direct template documents (#1215)

Introduces customization options for the document completion email
template to allow for custom email bodies and subjects for documents
created from direct templates.


## Testing Performed
- Verified correct rendering of custom email subject and body for direct
template documents
- Verified the all other completed email types are sent correctly

packages/trpc/server/template-router/router.ts

@@ -59,12 +59,18 @@ export const templateRouter = router({
     .input(ZCreateDocumentFromDirectTemplateMutationSchema)
     .mutation(async ({ input, ctx }) => {
       try {
-        const { directRecipientEmail, directTemplateToken, signedFieldValues, templateUpdatedAt } =
-          input;
+        const {
+          directRecipientName,
+          directRecipientEmail,
+          directTemplateToken,
+          signedFieldValues,
+          templateUpdatedAt,
+        } = input;
 
         const requestMetadata = extractNextApiRequestMetadata(ctx.req);
 
         return await createDocumentFromDirectTemplate({
+          directRecipientName,
           directRecipientEmail,
           directTemplateToken,
           signedFieldValues,