[SPARK-34768][SQL] Respect the default input buffer size in Univocity

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

This PR proposes to follow Univocity's input buffer.

### Why are the changes needed?

- Firstly, it's best to trust their judgement on the default values. Also 128 is too low.
- Default values arguably have more test coverage in Univocity.
- It will also fix https://github.com/uniVocity/univocity-parsers/issues/449
- ^ is a regression compared to Spark 2.4

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

No. In addition, It fixes a regression.

### How was this patch tested?

Manually tested, and added a unit test.

Closes #31858 from HyukjinKwon/SPARK-34768.

Authored-by: HyukjinKwon <gurwls223@apache.org>
Signed-off-by: HyukjinKwon <gurwls223@apache.org>

sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/csv/CSVOptions.scala

@@ -166,8 +166,6 @@ class CSVOptions(
 
   val quoteAll = getBool("quoteAll", false)
 
-  val inputBufferSize = 128
-
   /**
    * The max error content length in CSV parser/writer exception message.
    */
@@ -259,7 +257,6 @@ class CSVOptions(
     settings.setIgnoreLeadingWhitespaces(ignoreLeadingWhiteSpaceInRead)
     settings.setIgnoreTrailingWhitespaces(ignoreTrailingWhiteSpaceInRead)
     settings.setReadInputOnSeparateThread(false)
-    settings.setInputBufferSize(inputBufferSize)
     settings.setMaxColumns(maxColumns)
     settings.setNullValue(nullValue)
     settings.setEmptyValue(emptyValueInRead)

sql/core/src/test/scala/org/apache/spark/sql/execution/datasources/csv/CSVSuite.scala

@@ -2452,6 +2452,17 @@ abstract class CSVSuite
       assert(result.sameElements(exceptResults))
     }
   }
+
+  test("SPARK-34768: counting a long record with ignoreTrailingWhiteSpace set to true") {
+    val bufSize = 128
+    val line = "X" * (bufSize - 1) + "| |"
+    withTempPath { path =>
+      Seq(line).toDF.write.text(path.getAbsolutePath)
+      assert(spark.read.format("csv")
+        .option("delimiter", "|")
+        .option("ignoreTrailingWhiteSpace", "true").load(path.getAbsolutePath).count() == 1)
+    }
+  }
 }
 
 class CSVv1Suite extends CSVSuite {