[SPARK-37447][SQL] Cache LogicalPlan.isStreaming() result in a lazy val

### What changes were proposed in this pull request?

This PR adds caching to `LogicalPlan.isStreaming()`: the default implementation's result will now be cached in a `private lazy val`.

### Why are the changes needed?

This improves the performance of the `DeduplicateRelations` analyzer rule.

The default implementation of `isStreaming` recursively visits every node in the tree. `DeduplicateRelations.renewDuplicatedRelations` is recursively invoked on every node in the tree and each invocation calls `isStreaming`. This leads to `O(n^2)` invocations of `isStreaming` on leaf nodes.

Caching `isStreaming` avoids this performance problem.

### Does this PR introduce _any_ user-facing change?

No.

### How was this patch tested?

Correctness should be covered by existing tests.

This significantly improved `DeduplicateRelations` performance in local microbenchmarking with large query plans (~20% reduction in that rule's runtime in one of my tests).

Closes #34691 from JoshRosen/cache-LogicalPlan.isStreaming.

Authored-by: Josh Rosen <[email protected]>
Signed-off-by: Wenchen Fan <[email protected]>

Author: JoshRosen

sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/plans/logical/LogicalPlan.scala

@@ -41,7 +41,8 @@ abstract class LogicalPlan
   def metadataOutput: Seq[Attribute] = children.flatMap(_.metadataOutput)
 
   /** Returns true if this subtree has data from a streaming data source. */
-  def isStreaming: Boolean = children.exists(_.isStreaming)
+  def isStreaming: Boolean = _isStreaming
+  private[this] lazy val _isStreaming = children.exists(_.isStreaming)
 
   override def verboseStringWithSuffix(maxFields: Int): String = {
     super.verboseString(maxFields) + statsCache.map(", " + _.toString).getOrElse("")