[Maybe] Unify error handling for waitForWorkflowCompletion and tryGettingWorkflowResults

[longquanzheng]

Today the withWait api will throw client side exception with long poll timeout sub status . Because this is a 4xx error from server.

iwf-java-sdk/src/test/java/io/iworkflow/integ/WorkflowUncompletedTest.java

Line 44 in 3409ea7

Assertions.assertEquals(ErrorSubStatus.LONG_POLL_TIME_OUT_SUB_STATUS, e.getErrorSubStatus());

However, tryGetting api will throw UncompletedException.

this inconsistency could be a bit confusing.

[longquanzheng]

Idea 1:

• Throw WorkflowAbnormalExitException for failure/timeout/canceld/terminated (this naming is consistent with our naming for IdReusePolicy. ALLOW_IF_PREVIOUS_EXITS_ABNORMALLY
• Throw WorkflowStillRunningException for long poll timeout in getSimpleResultWithWait , or still running for tryGettingSimpleResult

We may be able to keep backward compatibility:

• Change WorkflowUncompletedException to an interface
• WorkflowAbnormalExitException and WorkflowStillRunningException both implement from the interface and extend from ClientSideException