feat: split client to separate class

mod.ts

@@ -1,5 +1,7 @@
 export * from "./libraries/action.ts";
+export * from "./libraries/adapter.ts";
 export * from "./libraries/api.ts";
+export * from "./libraries/client.ts";
 export * from "./libraries/errors.ts";
 export * from "./libraries/relay.ts";
 export * from "./libraries/route.ts";