concurrentlinkedhashmap-lru 已经很老且不维护了，是不是考虑将它换掉，用Caffeine 替换

[su-yh]

Issue Description

Type: bug report or feature request

Describe what happened (or what feature you want)

concurrentlinkedhashmap-lru 已经很老了，没有维护。

Describe what you expected to happen

是不是可以考虑下使用Caffeine 替换。

Caffeine is the Java 8 successor to ConcurrentLinkedHashMap and Guava's cache. Projects should prefer Caffeine and migrate when requiring JDK8 or higher. The previous caching projects are supported in maintenance mode.

How to reproduce it (as minimally and precisely as possible)

Tell us your environment

Anything else we need to know?

[sczyh30]

Contributions are welcome.

[shaoqiang6]

I tried to fix this issue. I will retract my request if it offends anyone. thanks

[weishiya]

is this issue closed? I want to contribute this issue

[su-yh]

is this issue closed? I want to contribute this issue

#2878 https://github.com/alibaba/Sentinel/pull/2878 已经有人处理了，还没有合并