[KYUUBI #691] Rename getQueryLog to fetchQueryLog

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### _Why are the changes needed?_
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Rename `ExecuteStatement#getQueryLog` to `ExecuteStatement#fetchQueryLog`, to suppress IDEA complaination **Accessor-like named method has Unit result type** and make it more readable.

### _How was this patch tested?_
- [ ] Add some test cases that check the changes thoroughly including negative and positive cases if possible

- [ ] Add screenshots for manual tests if appropriate

- [x] [Run test](https://kyuubi.readthedocs.io/en/latest/tools/testing.html#running-tests) locally before make a pull request

Closes #691 from pan3793/readable.

Closes #691

96c0c26 [Cheng Pan] Rename getQueryLog to fetchQueryLog

Authored-by: Cheng Pan <379377944@qq.com>
Signed-off-by: Kent Yao <yao@apache.org>

kyuubi-main/src/main/scala/org/apache/kyuubi/operation/ExecuteStatement.scala

@@ -84,7 +84,7 @@ class ExecuteStatement(
     var statusResp = client.GetOperationStatus(statusReq)
     var isComplete = false
     while (!isComplete) {
-      getQueryLog()
+      fetchQueryLog()
       verifyTStatus(statusResp.getStatus)
       val remoteState = statusResp.getOperationState
       info(s"Query[$statementId] in ${remoteState.name()}")
@@ -118,10 +118,10 @@ class ExecuteStatement(
       }
     }
     // see if anymore log could be fetched
-    getQueryLog()
+    fetchQueryLog()
   } catch onError()
 
-  private def getQueryLog(): Unit = {
+  private def fetchQueryLog(): Unit = {
     getOperationLog.foreach { logger =>
       try {
         val resp = client.FetchResults(fetchLogReq)