Packer (#172)

* introduce pako and add general packer interface

* add tests for packer

* use function API instead of class API for better tree shaking support

* refcatoring the rollup bundle config

typings/record/index.d.ts

@@ -1,5 +1,5 @@
-import { recordOptions, listenerHandler } from '../types';
-declare function record(options?: recordOptions): listenerHandler | undefined;
+import { eventWithTime, recordOptions, listenerHandler } from '../types';
+declare function record<T = eventWithTime>(options?: recordOptions<T>): listenerHandler | undefined;
 declare namespace record {
     var addCustomEvent: <T>(tag: string, payload: T) => void;
 }