[SPARK-16061][SQL][MINOR] The property...

[SPARK-16061][SQL][MINOR] The property "spark.streaming.stateStore.maintenanceInterval" should be renamed to "spark.sql.streaming.stateStore.maintenanceInterval"

## What changes were proposed in this pull request?
The property spark.streaming.stateStore.maintenanceInterval should be renamed and harmonized with other properties related to Structured Streaming like spark.sql.streaming.stateStore.minDeltasForSnapshot.

## How was this patch tested?
Existing unit tests.

Author: Kousuke Saruta <sarutak@oss.nttdata.co.jp>

Closes #13777 from sarutak/SPARK-16061.

sql/core/src/main/scala/org/apache/spark/sql/execution/streaming/state/StateStore.scala

@@ -115,7 +115,7 @@ case class KeyRemoved(key: UnsafeRow) extends StoreUpdate
  */
 private[sql] object StateStore extends Logging {
 
-  val MAINTENANCE_INTERVAL_CONFIG = "spark.streaming.stateStore.maintenanceInterval"
+  val MAINTENANCE_INTERVAL_CONFIG = "spark.sql.streaming.stateStore.maintenanceInterval"
   val MAINTENANCE_INTERVAL_DEFAULT_SECS = 60
 
   private val loadedProviders = new mutable.HashMap[StateStoreId, StateStoreProvider]()