feat: add multi-search, adjust types to allow type narrowing

src/types/search.ts

@@ -1,6 +1,13 @@
+import { MovieWithMediaType, PersonWithMediaType, TVWithMediaType } from '.';
+
 export interface Search<T> {
   page: number;
   results: T[];
   total_pages: number;
   total_results: number;
 }
+
+export type MultiSearchResult =
+  | MovieWithMediaType
+  | TVWithMediaType
+  | PersonWithMediaType;