feat: implement user impersonation feature (#976)

* feat: wip impersonate user

* feat: add ability to impersonate an user

* fix: remove console.log

* fix: unused import

server/src/core/auth/dto/impersonate.input.ts

@@ -0,0 +1,11 @@
+import { ArgsType, Field } from '@nestjs/graphql';
+
+import { IsNotEmpty, IsString } from 'class-validator';
+
+@ArgsType()
+export class ImpersonateInput {
+  @Field(() => String)
+  @IsNotEmpty()
+  @IsString()
+  userId: string;
+}