[LFUCache]Add frequency of key and delete the empty cache queue

[iiweniiang]

What is the purpose of the change

You can not get frequency of the key or delete the empty cache queue before.

Brief changelog

1.Change the freqTable from Array to TreeMap
2.Add a timeout field to determine if an empty queue can be deleted
3.Add a method to get frequency of the key

Verifying this change

Checklist

• Make sure there is a GitHub_issue field for the change (usually before you start working on it). Trivial changes like typos do not require a GitHub issue. Your pull request should address just this issue, without pulling in other changes - one PR resolves one issue.
• Each commit in the pull request should have a meaningful subject line and body.
• Write a pull request description that is detailed enough to understand what the pull request does, how, and why.
• Check if is necessary to patch to Dubbo 3 if you are work on Dubbo 2.7
• Write necessary unit-test to verify your logic correction, more mock a little better when cross module dependency exist. If the new feature or significant change is committed, please remember to add sample in dubbo samples project.
• Add some description to dubbo-website project if you are requesting to add a feature.
• GitHub Actions works fine on your own branch.
• If this contribution is large, please follow the Software Donation Guide.

[codecov-commenter]

Codecov Report

Merging #7967 (c1c5441) into master (ab4ced5) will decrease coverage by 0.01%.
The diff coverage is 73.56%.

@@             Coverage Diff              @@
##             master    #7967      +/-   ##
============================================
- Coverage     60.85%   60.84%   -0.02%     
+ Complexity      491      490       -1     
============================================
  Files          1089     1089              
  Lines         43877    43936      +59     
  Branches       6412     6420       +8     
============================================
+ Hits          26703    26734      +31     
- Misses        14210    14235      +25     
- Partials       2964     2967       +3     

Impacted Files	Coverage Δ
...n/java/org/apache/dubbo/common/utils/LFUCache.java	80.86% <73.56%> (-5.42%)	⬇️
...che/dubbo/remoting/transport/mina/MinaChannel.java	35.52% <0.00%> (-10.53%)	⬇️
...ng/transport/dispatcher/all/AllChannelHandler.java	89.65% <0.00%> (-6.90%)	⬇️
...in/java/org/apache/dubbo/common/utils/JVMUtil.java	86.79% <0.00%> (-5.67%)	⬇️
.../apache/dubbo/remoting/transport/AbstractPeer.java	58.69% <0.00%> (-4.35%)	⬇️
...ubbo/registry/support/AbstractRegistryFactory.java	83.09% <0.00%> (-2.82%)	⬇️
...pache/dubbo/registry/support/AbstractRegistry.java	77.40% <0.00%> (-2.23%)	⬇️
...ting/zookeeper/curator/CuratorZookeeperClient.java	69.54% <0.00%> (-1.15%)	⬇️
...che/dubbo/common/compiler/support/JdkCompiler.java	63.55% <0.00%> (ø)
...a/org/apache/dubbo/rpc/filter/AccessLogFilter.java	79.10% <0.00%> (ø)
... and 18 more

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update ab4ced5...c1c5441. Read the comment docs.