feat: provide a toggle to enable discord integration (#2548)

* feat: provide a toggle to enable discord integration

* chore: remove feature flag toggle

Author: aldy505

sentry/config.example.yml

@@ -119,3 +119,15 @@ transaction-events.force-disable-internal-project: true
 # slack.signing-secret: <signing secret>
 ## If legacy-app is True use verfication-token instead of signing-secret
 # slack.verification-token: <verification token>
+
+
+#######################
+# Discord Integration #
+#######################
+
+# Refer to https://develop.sentry.dev/integrations/discord/
+
+# discord.application-id: "<application id>"
+# discord.public-key: "<public key>"
+# discord.client-secret: "<client secret>"
+# discord.bot-token: "<bot token>"