fix: allow template recipients to be filled (#1148)

## Description

Update the template flow to allow for entering recipient placeholder
emails and names

## Changes Made

- General refactoring
- Added advanced recipient settings for future usage

packages/lib/constants/template.ts

@@ -1 +1,2 @@
-export const TEMPLATE_RECIPIENT_PLACEHOLDER_REGEX = /recipient\.\d+@documenso\.com/i;
+export const TEMPLATE_RECIPIENT_EMAIL_PLACEHOLDER_REGEX = /recipient\.\d+@documenso\.com/i;
+export const TEMPLATE_RECIPIENT_NAME_PLACEHOLDER_REGEX = /Recipient \d+/i;