[3.0] Lock-free ConfigManager and improve config checking

[kylixs]

What is the purpose of the change

• Change ConfigManager to lock-free with ConcurrentHashMap
• Improve config equals() and toString() performance
• Improve checking large numbers of reference/service configs

Brief changelog

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.
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• 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.
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• If this contribution is large, please follow the Software Donation Guide.

[codecov-commenter]

Codecov Report

Merging #8289 (5fb6ab3) into 3.0 (026fb43) will decrease coverage by 0.20%.
The diff coverage is 89.89%.

@@             Coverage Diff              @@
##                3.0    #8289      +/-   ##
============================================
- Coverage     64.04%   63.84%   -0.21%     
+ Complexity      313      312       -1     
============================================
  Files          1073     1077       +4     
  Lines         45271    45486     +215     
  Branches       6813     6840      +27     
============================================
+ Hits          28994    29039      +45     
- Misses        13063    13212     +149     
- Partials       3214     3235      +21     

Impacted Files	Coverage Δ
...org/apache/dubbo/config/context/ConfigManager.java	76.63% <89.28%> (-3.50%)	⬇️
...n/java/org/apache/dubbo/config/AbstractConfig.java	80.23% <90.24%> (-0.47%)	⬇️
...g/apache/dubbo/config/AbstractInterfaceConfig.java	87.27% <100.00%> (+0.33%)	⬆️
...o/registry/zookeeper/ZookeeperRegistryFactory.java	66.66% <0.00%> (-33.34%)	⬇️
...tore/zookeeper/ZookeeperMetadataReportFactory.java	66.66% <0.00%> (-33.34%)	⬇️
...ookeeper/ZookeeperDynamicConfigurationFactory.java	66.66% <0.00%> (-33.34%)	⬇️
...dubbo/common/status/support/LoadStatusChecker.java	46.15% <0.00%> (-15.39%)	⬇️
...ng/transport/dispatcher/WrappedChannelHandler.java	47.82% <0.00%> (-15.22%)	⬇️
...ng/transport/dispatcher/all/AllChannelHandler.java	68.96% <0.00%> (-13.80%)	⬇️
.../remoting/transport/netty4/NettyClientHandler.java	61.01% <0.00%> (-6.78%)	⬇️
... and 40 more

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