Add waitForStateExecutionCompletion API

[longquanzheng]

No description provided.

[duoertai]

RpcTest > testRPCLocking() FAILED
feign.RetryableException at RpcTest.java:93
Caused by: feign.FeignException$InternalServerError at RpcTest.java:93

[duoertai]

[500 Internal Server Error] during [POST] to [http://localhost:8801/api/v1/workflow/rpc] [DefaultApi#apiV1WorkflowRpcPost(WorkflowRpcRequest)]: [{"detail":"Workflow task is not scheduled yet.","subStatus":"UNCATEGORIZED_SUB_STATUS"}]

[duoertai]

ran the test at my local, it seems when the test call invoke rpc -> getCounter, the workflow is stuck for a while with the 1st workflow task not scheduled,

[codecov]

Codecov Report

Merging #207 (d4c6f9e) into main (d2ae843) will increase coverage by 0.35%.
The diff coverage is 69.23%.

@@             Coverage Diff              @@
##               main     #207      +/-   ##
============================================
+ Coverage     71.93%   72.29%   +0.35%     
- Complexity      389      392       +3     
============================================
  Files            61       61              
  Lines          1593     1606      +13     
  Branches        140      141       +1     
============================================
+ Hits           1146     1161      +15     
+ Misses          376      373       -3     
- Partials         71       72       +1     

Files	Coverage Δ
src/main/java/io/iworkflow/core/Client.java	63.02% <100.00%> (+0.31%)	⬆️
...io/iworkflow/core/UnregisteredWorkflowOptions.java	100.00% <ø> (ø)
...c/main/java/io/iworkflow/core/WorkflowOptions.java	100.00% <ø> (ø)
...ain/java/io/iworkflow/core/UnregisteredClient.java	62.01% <63.63%> (+0.09%)	⬆️

... and 1 file with indirect coverage changes

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