Initial affiliate codes implementation (#4382)

* Initial affiliate codes implementation

* some more docs to codes

* sqlx prepare

* Address PR comments

* Address more PR comments

* fix clippy

* Switch to using Json<T> for type-safe responses

apps/labrinth/src/database/models/ids.rs

@@ -1,6 +1,6 @@
 use super::DatabaseError;
 use crate::models::ids::{
-    ChargeId, CollectionId, FileId, ImageId, NotificationId,
+    AffiliateCodeId, ChargeId, CollectionId, FileId, ImageId, NotificationId,
     OAuthAccessTokenId, OAuthClientAuthorizationId, OAuthClientId,
     OAuthRedirectUriId, OrganizationId, PatId, PayoutId, ProductId,
     ProductPriceId, ProjectId, ReportId, SessionId, SharedInstanceId,
@@ -263,6 +263,10 @@ db_id_interface!(
     VersionId,
     generator: generate_version_id @ "versions",
 );
+db_id_interface!(
+    AffiliateCodeId,
+    generator: generate_affiliate_code_id @ "affiliate_codes",
+);
 
 short_id_type!(CategoryId);
 short_id_type!(GameId);