Support persistence caching

[longquanzheng]

Caching feature is now supported in server 1.16.0: https://github.com/indeedeng/iwf#caching

Just follow what has been done in Java SDK: indeedeng/iwf-java-sdk#167

And the rename indeedeng/iwf-java-sdk#170

Also add a sample to use it in https://github.com/indeedeng/iwf-golang-samples

Follow the sample in Java: https://github.com/indeedeng/iwf-java-samples/blob/main/src/main/java/io/iworkflow/workflow/jobpost/JobPostWorkflow.java