feat(neuralsearch): adding the semanticSearch settings to client-search (#1450)

* feat: adding the semanticSearch settings to client-search

* feat: update comment

Author: cdhawke

packages/client-search/src/types/Settings.ts

@@ -310,6 +310,14 @@ export type Settings = {
    */
   readonly mode?: 'neuralSearch' | 'keywordSearch';
 
+  /**
+   * The settings relevant for configuration of the semantic search engine.
+   * These settings are only used when the mode is set to 'neuralSearch'.
+   */
+  readonly semanticSearch?: {
+    readonly eventSources?: readonly string[];
+  };
+
   /**
    * Content defining how the search interface should be rendered.
    * This is set via the settings for a default value and can be overridden via rules