feat(turbo-gen): templates for gen event consume (handler + Payload task)

turbo/generators/templates/event/consume/handler.ts.hbs

@@ -0,0 +1,14 @@
+// packages/{{kebabCase feature}}/src/events/handlers/on-{{kebabCase publisher}}-{{kebabCase event}}.handler.ts
+import type { {{pascalCase event}}Event } from "@repo/{{kebabCase publisher}}";
+
+export type IOn{{pascalCase publisher}}{{pascalCase event}}Handler = ReturnType<
+  typeof on{{pascalCase publisher}}{{pascalCase event}}Handler
+>;
+
+export const on{{pascalCase publisher}}{{pascalCase event}}Handler =
+  () =>
+  async (_event: {{pascalCase event}}Event): Promise<void> => {
+    // TODO: implement the reaction. Inject dependencies via the factory's
+    // constructor and use them here. The handler runs inside the consumer's
+    // span+capture sandwich, so just throwing on failure is the right shape.
+  };