Introduce Invocation#getInvokedInvokers to get invokers for ClusterFilter

[AlbumenJ]

What is the purpose of the change

    /**
     * To add invoked invokers into invocation. Can be used in ClusterFilter or Filter for tracing or debugging purpose.
     * Currently, only support in consumer side.
     *
     * @param invoker invoked invokers
     */
    void addInvokedInvoker(Invoker<?> invoker);

    /**
     * Get all invoked invokers in current invocation.
     * NOTICE: A curtain invoker could be invoked for twice or more if retries.
     *
     * @return invokers
     */
    List<Invoker<?>> getInvokedInvokers();

Brief changelog

Verifying this change

Checklist

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[CrazyHZM]

LGTM

[sonarcloud]

Kudos, SonarCloud Quality Gate passed!   

0 Bugs
0 Vulnerabilities
0 Security Hotspots
1 Code Smell

50.0% Coverage
0.0% Duplication

[codecov-commenter]

Codecov Report

Merging #11359 (32ff8f2) into 3.2 (f0764b3) will decrease coverage by 4.56%.
The diff coverage is 50.00%.

@@             Coverage Diff              @@
##                3.2   #11359      +/-   ##
============================================
- Coverage     69.39%   64.83%   -4.56%     
+ Complexity      132       14     -118     
============================================
  Files          1514     1487      -27     
  Lines         81223    62370   -18853     
  Branches      14407     9133    -5274     
============================================
- Hits          56366    40439   -15927     
+ Misses        20043    17711    -2332     
+ Partials       4814     4220     -594     

Impacted Files	Coverage Δ
...rc/main/java/com/alibaba/dubbo/rpc/Invocation.java	8.33% <0.00%> (-0.56%)	⬇️
...main/java/com/alibaba/dubbo/rpc/RpcInvocation.java	0.00% <0.00%> (ø)
...src/main/java/org/apache/dubbo/rpc/Invocation.java	20.00% <ø> (ø)
...bo/rpc/cluster/support/AbstractClusterInvoker.java	79.60% <100.00%> (-4.66%)	⬇️
.../main/java/org/apache/dubbo/rpc/RpcInvocation.java	70.00% <100.00%> (-2.12%)	⬇️
...luster/router/script/ScriptStateRouterFactory.java	0.00% <0.00%> (-100.00%)	⬇️
...he/dubbo/test/common/impl/GreetingServiceImpl.java	0.00% <0.00%> (-100.00%)	⬇️
...zookeeper/curator/CuratorZookeeperTransporter.java	0.00% <0.00%> (-100.00%)	⬇️
.../serialize/hessian2/Hessian2SerializerFactory.java	0.00% <0.00%> (-100.00%)	⬇️
...nfigure/DubboRelaxedBinding2AutoConfiguration.java	0.00% <0.00%> (-100.00%)	⬇️
... and 483 more

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