Limiter bucket of ratelimit.

LimiterBucketRule Limiter bucket rule capacity is the number of requests in the bucket fill interval is the interval of the bucket Key：自定义键值对名称。 FillInterval：间隔多久时间放 N 个令牌。 Capacity：令牌桶的容量。 Quantum：每次到达间隔时间后所放的具体令牌数量。.

MethodLimiter for router limiter implement LimiterInterface.

LimiterInterface Limiter interface Key：获取对应的限流器的键值对名称。 Key returns the key for the given gin context.