feat: add stdout and filesystem notification channels (#2925)

* feat: add filesystem and stdout notification channels

* configure through env vars

* compile

* feat: add compact option for debug notification channels

* fix channel mock generation

* avoid sensitive information in error message

Co-authored-by: Livio Amstutz <livio.a@gmail.com>

* add review improvements

Co-authored-by: Livio Amstutz <livio.a@gmail.com>

cmd/zitadel/system-defaults.yaml

@@ -83,9 +83,6 @@ SystemDefaults:
       DomainClaimed: '$ZITADEL_ACCOUNTS/login'
       PasswordlessRegistration: '$ZITADEL_ACCOUNTS/login/passwordless/init'
     Providers:
-      Chat:
-        Url: $CHAT_URL
-        SplitCount: 4000
       Email:
         SMTP:
           Host: $SMTP_HOST
@@ -98,6 +95,18 @@ SystemDefaults:
         SID: $TWILIO_SERVICE_SID
         Token: $TWILIO_TOKEN
         From: $TWILIO_SENDER_NAME
+      FileSystem:
+        Enabled: $FS_NOTIFICATIONS_ENABLED
+        Path: $FS_NOTIFICATIONS_PATH
+        Compact: $FS_NOTIFICATIONS_COMPACT
+      Log:
+        Enabled: $LOG_NOTIFICATIONS_ENABLED
+        Compact: $LOG_NOTIFICATIONS_COMPACT
+      Chat:
+        Enabled: $CHAT_ENABLED
+        Url: $CHAT_URL
+        Compact: $CHAT_COMPACT
+        SplitCount: 4000
     TemplateData:
       InitCode:
         Title: 'InitCode.Title'
@@ -146,4 +155,4 @@ SystemDefaults:
     EncryptionConfig:
       EncryptionKeyID: $ZITADEL_OIDC_KEYS_ID
     SigningKeyRotationCheck: 10s
-    SigningKeyGracefulPeriod: 10m
+    SigningKeyGracefulPeriod: 10m