feat: add direct templates links (#1165)

## Description

Direct templates links is a feature that provides template owners the
ability to allow users to create documents based of their templates.

## General outline

This works by allowing the template owner to configure a "direct
recipient" in the template.

When a user opens the direct link to the template, it will create a flow
where they sign the fields configured by the template owner for the
direct recipient. After these fields are signed the following will
occur:

- A document will be created where the owner is the template owner
- The direct recipient fields will be signed
- The document will be sent to any other recipients configured in the
template
- If there are none the document will be immediately completed

## Notes

There's a custom prisma migration to migrate all documents to have
'DOCUMENT' as the source, then sets the column to required.

---------

Co-authored-by: Lucas Smith <me@lucasjamessmith.me>

packages/ee/server-only/limits/schema.ts

@@ -10,6 +10,10 @@ export const ZLimitsSchema = z.object({
     .preprocess((v) => (v === null ? Infinity : Number(v)), z.number())
     .optional()
     .default(0),
+  directTemplates: z
+    .preprocess((v) => (v === null ? Infinity : Number(v)), z.number())
+    .optional()
+    .default(0),
 });
 
 export type TLimitsSchema = z.infer<typeof ZLimitsSchema>;