rate limit and circuit breaker user guide of Kmesh dual-engine mode

[LiZhenCheng9527]

What would you like to be added:

Why is this needed:
Rate limiting and circuit breaker are crucial features in service mesh traffic management. Kmesh, leveraging Waypoint, already possesses these functionalities. However, it lacks a corresponding user guide. Therefore, we need an appropriate user guide to instruct users on how to utilize Kmesh's rate limit and circuit breaker features.

[LiZhenCheng9527]

• rate limit user guide
• circuir breaker user guide

[LiZhenCheng9527]

/assign @zrggw