fix: make client options optional

Author: Ho3einWave

src/types/client.ts

@@ -1,8 +1,8 @@
 export type MyTonSwapClientOptions = {
-    apiKey: string;
-    tonCenterApiKey: string;
-    baseUrl: string;
-    headers: Record<string, string>;
+    apiKey?: string;
+    tonCenterApiKey?: string;
+    baseUrl?: string;
+    headers?: Record<string, string>;
 };
 
 export type MyTonSwapResponse<Tdata = any, Terror = any> = {