feat: add template enhancements (#1154)

## Description

General enhancements for templates.

## Changes Made

Added the following changes to the template flow:
- Allow adding document meta settings
- Allow adding email settings
- Allow adding document access & action authentication
- Allow adding recipient action authentication
- Save the state between template steps similar to how it works for
documents

Other changes:
- Extract common fields between document and template flows
- Remove the title field from "Use template" since we now have it as
part of the template flow
- Add new API endpoint for generating templates

## Testing Performed

Added E2E tests for templates and creating documents from templates

packages/ui/components/document/document-send-email-message-helper.tsx

@@ -0,0 +1,34 @@
+'use client';
+
+import React from 'react';
+
+export const DocumentSendEmailMessageHelper = () => {
+  return (
+    <div>
+      <p className="text-muted-foreground text-sm">
+        You can use the following variables in your message:
+      </p>
+
+      <ul className="mt-2 flex list-inside list-disc flex-col gap-y-2 text-sm">
+        <li className="text-muted-foreground">
+          <code className="text-muted-foreground bg-muted-foreground/20 rounded p-1 text-sm">
+            {'{signer.name}'}
+          </code>{' '}
+          - The signer's name
+        </li>
+        <li className="text-muted-foreground">
+          <code className="text-muted-foreground bg-muted-foreground/20 rounded p-1 text-sm">
+            {'{signer.email}'}
+          </code>{' '}
+          - The signer's email
+        </li>
+        <li className="text-muted-foreground">
+          <code className="text-muted-foreground bg-muted-foreground/20 rounded p-1 text-sm">
+            {'{document.name}'}
+          </code>{' '}
+          - The document's name
+        </li>
+      </ul>
+    </div>
+  );
+};