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/lib/schemas/common.ts

@@ -0,0 +1,12 @@
+import { z } from 'zod';
+
+import { URL_REGEX } from '../constants/url-regex';
+
+/**
+ * Note this allows empty strings.
+ */
+export const ZUrlSchema = z
+  .string()
+  .refine((value) => value === undefined || value === '' || URL_REGEX.test(value), {
+    message: 'Please enter a valid URL',
+  });