feat: wip casl policies (#334)

* feat: wip casl policies

* feat: add ability guard on pipeline resolvers

* fix: test

server/src/ability/interfaces/ability-handler.interface.ts

@@ -0,0 +1,11 @@
+import { ExecutionContext, Type } from '@nestjs/common';
+import { AppAbility } from '../ability.factory';
+
+export interface IAbilityHandler {
+  handle(
+    ability: AppAbility,
+    executionContext: ExecutionContext,
+  ): Promise<boolean> | boolean;
+}
+
+export type AbilityHandler = Type<IAbilityHandler>;