feat(gateway): Discord channel auto-creation on project bootstrap (#200)

Co-authored-by: Jason Woltje <jason@diversecanvas.com>
Co-committed-by: Jason Woltje <jason@diversecanvas.com>

apps/gateway/src/plugin/plugin.interface.ts

@@ -2,4 +2,10 @@ export interface IChannelPlugin {
   readonly name: string;
   start(): Promise<void>;
   stop(): Promise<void>;
+  /** Called when a new project is bootstrapped. Return channelId if a channel was created. */
+  onProjectCreated?(project: {
+    id: string;
+    name: string;
+    description?: string;
+  }): Promise<{ channelId: string } | null>;
 }