feat(spotlight): add support for custom search-engines (#1200)

* feat(spotlight): add search settings link

* feat(search-engine): add to manage pages

* feat(spotlight): add children option for external search engines

* chore: revert search settings

* fix: deepsource issue

* fix: inconsistent breadcrum placement

* chore: address pull request feedback

packages/validation/src/search-engine.ts

@@ -0,0 +1,20 @@
+import { z } from "zod";
+
+const manageSearchEngineSchema = z.object({
+  name: z.string().min(1).max(64),
+  short: z.string().min(1).max(8),
+  iconUrl: z.string().min(1),
+  urlTemplate: z.string().min(1).startsWith("http").includes("%s"),
+  description: z.string().max(512).nullable(),
+});
+
+const editSearchEngineSchema = manageSearchEngineSchema
+  .extend({
+    id: z.string(),
+  })
+  .omit({ short: true });
+
+export const searchEngineSchemas = {
+  manage: manageSearchEngineSchema,
+  edit: editSearchEngineSchema,
+};