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/prisma/schema.prisma

@@ -261,6 +261,12 @@ enum DocumentStatus {
   COMPLETED
 }
 
+enum DocumentSource {
+  DOCUMENT
+  TEMPLATE
+  TEMPLATE_DIRECT_LINK
+}
+
 model Document {
   id             Int                 @id @default(autoincrement())
   userId         Int
@@ -281,6 +287,9 @@ model Document {
   deletedAt      DateTime?
   teamId         Int?
   team           Team?               @relation(fields: [teamId], references: [id])
+  templateId     Int?
+  template       Template?           @relation(fields: [templateId], references: [id], onDelete: SetNull)
+  source         DocumentSource
 
   auditLogs DocumentAuditLog[]
 
@@ -572,15 +581,29 @@ model Template {
   createdAt              DateTime      @default(now())
   updatedAt              DateTime      @default(now()) @updatedAt
 
-  team                 Team?        @relation(fields: [teamId], references: [id], onDelete: Cascade)
-  templateDocumentData DocumentData @relation(fields: [templateDocumentDataId], references: [id], onDelete: Cascade)
-  User                 User         @relation(fields: [userId], references: [id], onDelete: Cascade)
+  team                 Team?               @relation(fields: [teamId], references: [id], onDelete: Cascade)
+  templateDocumentData DocumentData        @relation(fields: [templateDocumentDataId], references: [id], onDelete: Cascade)
+  User                 User                @relation(fields: [userId], references: [id], onDelete: Cascade)
   Recipient            Recipient[]
   Field                Field[]
+  directLink           TemplateDirectLink?
+  documents            Document[]
 
   @@unique([templateDocumentDataId])
 }
 
+model TemplateDirectLink {
+  id         String   @id @unique @default(cuid())
+  templateId Int      @unique
+  token      String   @unique
+  createdAt  DateTime @default(now())
+  enabled    Boolean
+
+  directTemplateRecipientId Int
+
+  template Template @relation(fields: [templateId], references: [id], onDelete: Cascade)
+}
+
 model SiteSettings {
   id                   String   @id
   enabled              Boolean  @default(false)