[fix](connector) fix flight sql read json type

[gnehil]

Proposed changes

Issue Number: close #xxx

Problem Summary:

Fix read json type issue via arrow flight sql

org.apache.doris.spark.exception.DorisException: Unsupported type JSON of col: xxx
 at org.apache.doris.spark.client.read.RowBatch.<init>(RowBatch.java:136)
 at org.apache.doris.spark.client.read.DorisFlightSqlReader.hasNext(DorisFlightSqlReader.java:93)
 at org.apache.doris.spark.read.DorisPartitionReader.next(DorisPartitionReader.scala:48)
 at org.apache.spark.sql.execution.datasources.v2.PartitionIterator.hasNext(DataSourceRDD.scala:120)
 at org.apache.spark.sql.execution.datasources.v2.MetricsIterator.hasNext(DataSourceRDD.scala:158)
 at org.apache.spark.sql.execution.datasources.v2.DataSourceRDD$$anon$1.$anonfun$hasNext$1(DataSourceRDD.scala:63)
 at org.apache.spark.sql.execution.datasources.v2.DataSourceRDD$$anon$1.$anonfun$hasNext$1$adapted(DataSourceRDD.scala:63)
 at scala.Option.exists(Option.scala:376)
 at org.apache.spark.sql.execution.datasources.v2.DataSourceRDD$$anon$1.hasNext(DataSourceRDD.scala:63)
 at org.apache.spark.sql.execution.datasources.v2.DataSourceRDD$$anon$1.advanceToNextIter(DataSourceRDD.scala:97)
 at org.apache.spark.sql.execution.datasources.v2.DataSourceRDD$$anon$1.hasNext(DataSourceRDD.scala:63)
 at org.apache.spark.InterruptibleIterator.hasNext(InterruptibleIterator.scala:37)
 at scala.collection.Iterator$$anon$10.hasNext(Iterator.scala:460)
 at scala.collection.Iterator$$anon$10.hasNext(Iterator.scala:460)
 at org.apache.spark.sql.execution.SparkPlan.$anonfun$getByteArrayRdd$1(SparkPlan.scala:388)
 at org.apache.spark.rdd.RDD.$anonfun$mapPartitionsInternal$2(RDD.scala:893)
 at org.apache.spark.rdd.RDD.$anonfun$mapPartitionsInternal$2$adapted(RDD.scala:893)
 at org.apache.spark.rdd.MapPartitionsRDD.compute(MapPartitionsRDD.scala:52)
 at org.apache.spark.rdd.RDD.computeOrReadCheckpoint(RDD.scala:367)
 at org.apache.spark.rdd.RDD.iterator(RDD.scala:331)
 at org.apache.spark.scheduler.ResultTask.runTask(ResultTask.scala:93)
 at org.apache.spark.TaskContext.runTaskWithListeners(Ta 

Checklist(Required)

1. Does it affect the original behavior: (Yes/No/I Don't know)
2. Has unit tests been added: (Yes/No/No Need)
3. Has document been added or modified: (Yes/No/No Need)
4. Does it need to update dependencies: (Yes/No)
5. Are there any changes that cannot be rolled back: (Yes/No)

Further comments

If this is a relatively large or complex change, kick off the discussion at [email protected] by explaining why you chose the solution you did and what alternatives you considered, etc...

[JNSimba]

LGTM