feat: Circuite breaker

[leiysky]

The current backon only supports backoff on a single invocation, but can not correlate multiple invocations in a time window. Sometime we need to reject a invocation if it fails too many times in a specific time window.

failsafe-rs is a great impelementation , it will be nice if we can have one in backon.

[Xuanwo]

We can use our adjust API to implement this. Bypass the retry if permitted, otherwise returns None.