feat: add exa web search source (#124)

packages/freya-source-web-search/src/index.ts

@@ -0,0 +1,11 @@
+export { ExaSearchClient } from "./exa-client.ts"
+export { WebSearchSource } from "./web-search-source.ts"
+export {
+	WebSearchAction,
+	WebSearchType,
+	type WebSearchClient,
+	type WebSearchRequest,
+	type WebSearchResponse,
+	type WebSearchResult,
+	type WebSearchSourceOptions,
+} from "./types.ts"