Enable array-to-string cast coverage for float and binary types

Enable FloatType, DoubleType, and BinaryType in CometCastSuite's ArrayType-to-StringType coverage.

Allow ArrayType(BinaryType) casts to string to use the existing native binary string formatting path.

Co-authored-by: Codex <codex@openai.com>

Author: manuzhang

spark/src/main/scala/org/apache/comet/expressions/CometCast.scala

@@ -151,8 +151,6 @@ object CometCast extends CometExpressionSerde[Cast] with CometExprShim {
       case (ArrayType(DataTypes.DateType, _), ArrayType(toElementType, _))
           if toElementType != DataTypes.IntegerType && toElementType != DataTypes.StringType =>
         unsupported(fromType, toType)
-      case (dt: ArrayType, DataTypes.StringType) if dt.elementType == DataTypes.BinaryType =>
-        Incompatible()
       case (dt: ArrayType, DataTypes.StringType) =>
         isSupported(dt.elementType, DataTypes.StringType, timeZoneId, evalMode)
       case (dt: ArrayType, dt1: ArrayType) =>

spark/src/test/scala/org/apache/comet/CometCastSuite.scala

@@ -1555,9 +1555,9 @@ class CometCastSuite extends CometTestBase with AdaptiveSparkPlanHelper {
       IntegerType,
       LongType,
       ShortType,
-      // FloatType,
-      // DoubleType,
-      // BinaryType
+      FloatType,
+      DoubleType,
+      BinaryType,
       DecimalType(10, 2),
       DecimalType(38, 18)).foreach { dt =>
       val input = generateArrays(100, dt)