Optimize agent module

[jiangML]

For #23100

Changes proposed in this pull request:

• Merge agent-core into agent-bootstrap
• Split TimeRecorder, AgentReflectionUtil, RemotePluginConfigurationValidator into new shardingsphere-agent-plugin-core module
• Add dependency shade

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Before committing this PR, I'm sure that I have checked the following options:

• My code follows the code of conduct of this project.
• I have self-reviewed the commit code.
• I have (or in comment I request) added corresponding labels for the pull request.
• I have passed maven check locally : ./mvnw clean install -B -T1C -Dmaven.javadoc.skip -Dmaven.jacoco.skip -e.
• I have made corresponding changes to the documentation.
• I have added corresponding unit tests for my changes.

[codecov-commenter]

Codecov Report

Merging #23101 (6ae7ba7) into master (01f4968) will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@            Coverage Diff            @@
##             master   #23101   +/-   ##
=========================================
  Coverage     49.95%   49.96%           
  Complexity     2433     2433           
=========================================
  Files          4112     4112           
  Lines         57478    57478           
  Branches       9086     9086           
=========================================
+ Hits          28714    28717    +3     
+ Misses        26253    26250    -3     
  Partials       2511     2511           

Impacted Files	Coverage Δ
...ingsphere/agent/bootstrap/ShardingSphereAgent.java	0.00% <ø> (ø)
.../agent/bootstrap/classloader/AgentClassLoader.java	17.30% <ø> (ø)
...strap/config/loader/PluginConfigurationLoader.java	88.88% <ø> (ø)
...g/yaml/entity/YamlPluginCategoryConfiguration.java	100.00% <ø> (ø)
...ap/config/yaml/entity/YamlPluginConfiguration.java	100.00% <ø> (ø)
...p/config/yaml/entity/YamlPluginsConfiguration.java	100.00% <ø> (ø)
.../yaml/swapper/YamlPluginsConfigurationSwapper.java	85.71% <ø> (ø)
...gsphere/agent/bootstrap/logging/LoggerFactory.java	47.50% <ø> (ø)
...phere/agent/bootstrap/logging/LoggingListener.java	77.77% <ø> (ø)
...gsphere/agent/bootstrap/path/AgentPathBuilder.java	57.89% <ø> (ø)
... and 39 more

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