[Feature](Nereids) Add explain tree functionality. (#25446)
Add explain tree functionality which contains fragment ids for profile analysis.
```
mysql> explain tree select sum(l_orderkey) from lineitem, orders where l_orderkey = o_orderkey;
+-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| Explain String(Nereids Planner) |
+-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| [414]:[414: ResultSink]||[Fragment: 0]||VRESULT SINK|| MYSQL_PROTOCAL|| |
| --[414]:[414: VAGGREGATE (merge finalize)]||[Fragment: 0]||cardinality=1|| |
| ----[411]:[411: VEXCHANGE]||[Fragment: 0]||offset: 0|| |
| ------[411]:[411: DataStreamSink]||[Fragment: 1]||STREAM DATA SINK|| EXCHANGE ID: 411|| UNPARTITIONED |
| --------[408]:[408: VAGGREGATE (update serialize)]||[Fragment: 1]||cardinality=1|| |
| ----------[402]:[402: VHASH JOIN]||[Fragment: 1]||join op: INNER JOIN(PARTITIONED)[]||cardinality=593,132,346|| |
| ------------[392]:[392: VEXCHANGE]||[Fragment: 1]||offset: 0|| |
| --------------[392]:[392: DataStreamSink]||[Fragment: 2]||STREAM DATA SINK|| EXCHANGE ID: 392|| HASH_PARTITIONED |
| ----------------[386]:[386: VHIVE_SCAN_NODE]||[Fragment: 2]||table: lineitem||inputSplitNum=144, totalFileSize=16632158739, scanRanges=144||partition=1/1||cardinality=600037902, numNodes=1||pushdown agg=NONE|| |
| ------------[399]:[399: VEXCHANGE]||[Fragment: 1]||offset: 0|| |
| --------------[399]:[399: DataStreamSink]||[Fragment: 3]||STREAM DATA SINK|| EXCHANGE ID: 399|| HASH_PARTITIONED |
| ----------------[393]:[393: VHIVE_SCAN_NODE]||[Fragment: 3]||table: orders||inputSplitNum=48, totalFileSize=3984213353, scanRanges=48||partition=1/1||cardinality=150000000, numNodes=1||pushdown agg=NONE|| |
+-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
12 rows in set (0.04 sec)
```
3ce1bdae84