improvement(spark): Record the partition choosing sort time for analysis (apache#2364)

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

Record the partition choosing sort time for analysis

### Why are the changes needed?

For better optimize write duration

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

No.

### How was this patch tested?

Needn't

Co-authored-by: Junfan Zhang <zhangjunfan@qiyi.com>

Author: zuston

client-spark/common/src/main/java/org/apache/spark/shuffle/writer/WriteBufferManager.java

@@ -84,6 +84,7 @@ public class WriteBufferManager extends MemoryConsumer {
   private long copyTime = 0;
   private long serializeTime = 0;
   private long compressTime = 0;
+  private long sortTime = 0;
   private long writeTime = 0;
   private long estimateTime = 0;
   private long requireMemoryTime = 0;
@@ -335,9 +336,11 @@ public synchronized List<ShuffleBlockInfo> clear(double bufferSpillRatio) {
     bufferSpillRatio = Math.max(0.1, Math.min(1.0, bufferSpillRatio));
     List<Integer> partitionList = new ArrayList(buffers.keySet());
     if (Double.compare(bufferSpillRatio, 1.0) < 0) {
+      long start = System.currentTimeMillis();
       partitionList.sort(
           Comparator.comparingInt(o -> buffers.get(o) == null ? 0 : buffers.get(o).getMemoryUsed())
               .reversed());
+      sortTime += start;
       targetSpillSize = (long) ((getUsedBytes() - getInSendListBytes()) * bufferSpillRatio);
     }
 
@@ -607,6 +610,8 @@ public String getManagerCostInfo() {
         + writeTime
         + "], serializeTime["
         + serializeTime
+        + "], sortTime["
+        + sortTime
         + "], compressTime["
         + compressTime
         + "], estimateTime["