annotation cannt be serializable,so change to String

[jingxiang]

What is the purpose of the change

#7907

Brief changelog

修改MethodDefinition、ServiceDefinition中annotation序列化存储类型为String的字符串（FastJson在序列化List的时候存储的元数据就是[]，所以这里直接修改数据类型为List ）

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.

[AlbumenJ]

Please fix ut

[codecov-commenter]

Codecov Report

Merging #7908 (ea475ce) into master (f26ba91) will increase coverage by 0.06%.
The diff coverage is 50.00%.

@@             Coverage Diff              @@
##             master    #7908      +/-   ##
============================================
+ Coverage     60.30%   60.36%   +0.06%     
+ Complexity      546      487      -59     
============================================
  Files          1089     1090       +1     
  Lines         43852    43898      +46     
  Branches       6402     6386      -16     
============================================
+ Hits          26444    26499      +55     
+ Misses        14454    14422      -32     
- Partials       2954     2977      +23     

Impacted Files	Coverage Δ
...bo/metadata/definition/model/MethodDefinition.java	69.69% <ø> (ø)
...o/metadata/definition/model/ServiceDefinition.java	58.82% <ø> (ø)
.../metadata/definition/ServiceDefinitionBuilder.java	83.72% <50.00%> (-2.77%)	⬇️
...ookeeper/ZookeeperDynamicConfigurationFactory.java	0.00% <0.00%> (-100.00%)	⬇️
...pport/zookeeper/ZookeeperDynamicConfiguration.java	0.00% <0.00%> (-82.86%)	⬇️
.../configcenter/support/zookeeper/CacheListener.java	0.00% <0.00%> (-71.43%)	⬇️
...fig/configcenter/TreePathDynamicConfiguration.java	25.71% <0.00%> (-62.86%)	⬇️
...org/apache/dubbo/remoting/zookeeper/EventType.java	0.00% <0.00%> (-61.91%)	⬇️
...ng/transport/dispatcher/all/AllChannelHandler.java	62.06% <0.00%> (-27.59%)	⬇️
...rg/apache/dubbo/remoting/utils/PayloadDropper.java	76.92% <0.00%> (-15.39%)	⬇️
... and 129 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 f26ba91...ea475ce. Read the comment docs.

[jingxiang]

Please fix ut

its ok

[jingxiang]

@AlbumenJ

[zhangyz-hd]

Please in keeping with project Import-Layout.
See this file: /dubbo/codestyle/dubbo_codestyle_for_idea.xml

[jingxiang]

@zhangyz-hd act i use eclipse always.....