[SPARK-48604][SQL] Replace deprecated `new ArrowType.Decimal(precisio…

…n, scale)` method call

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

This pr replaces deprecated classes and methods of `arrow-vector` called in Spark:

- `Decimal(int precision, int scale)` -> `Decimal(
      JsonProperty("precision") int precision,
      JsonProperty("scale") int scale,
      JsonProperty("bitWidth") int bitWidth
    )`

All `arrow-vector` related Spark classes, I made a double check, only in `ArrowUtils` there is a deprecated  method call.
### Why are the changes needed?

Clean up deprecated API usage.

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

No.

### How was this patch tested?

Passed GA.

### Was this patch authored or co-authored using generative AI tooling?

No.

Closes #46961 from wayneguow/deprecated_arrow.

Authored-by: Wei Guo <guow93@gmail.com>
Signed-off-by: yangjie01 <yangjie01@baidu.com>

sql/api/src/main/scala/org/apache/spark/sql/util/ArrowUtils.scala

@@ -51,7 +51,7 @@ private[sql] object ArrowUtils {
     case BinaryType if !largeVarTypes => ArrowType.Binary.INSTANCE
     case _: StringType if largeVarTypes => ArrowType.LargeUtf8.INSTANCE
     case BinaryType if largeVarTypes => ArrowType.LargeBinary.INSTANCE
-    case DecimalType.Fixed(precision, scale) => new ArrowType.Decimal(precision, scale)
+    case DecimalType.Fixed(precision, scale) => new ArrowType.Decimal(precision, scale, 8 * 16)
     case DateType => new ArrowType.Date(DateUnit.DAY)
     case TimestampType if timeZoneId == null =>
       throw SparkException.internalError("Missing timezoneId where it is mandatory.")