CMM cache has no instrumentation

### Problem:

when using, and configuring the SDK, it would be good to understand the performance of the CMM cache, as having the cache to small can hurt performance

### Solution:

We could add open telemetry performance, maybe as an optional feature on the cache (that is what I have done in our application)

Happy to contribute this is its useful, and with some steer form the maintainers

In general is there a policy for instrumentation in thi project?

### Out of scope:

首先定位 CMM cache 的实现，并查阅项目关于 instrumentation 的指导。确认维护者偏好的 OpenTelemetry 策略，并定义可选的缓存性能测量范围；完成的标准是形成一种已达成共识且经过测试的 instrumentation 方案。

由索引模型根据 Issue 内容生成。