ARROW-8110: [C#] BuildArrays fails if NestedType is included

Bug:
An ArgumentOutOfRange exception is thrown when using a NestedType column which is not at the end of RecordBatch columns.
(If RecordBatch columns have only one NestedType column and it is at the end of the columns, this exception is not thrown because this do-while loop breaks before executing GetFieldByIndex on a wrong index.)

- Use correct index number
- Change TestData in order to test this bug

Closes #6621 from HashidaTKS/ARROW-8110_fix_NestedType_serialization_bug

Authored-by: Takashi Hashida <t-hashida@amiya.co.jp>
Signed-off-by: Sutou Kouhei <kou@clear-code.com>

csharp/src/Apache.Arrow/Ipc/ArrowReaderImplementation.cs

@@ -122,10 +122,10 @@ internal static ByteBuffer CreateByteBuffer(ReadOnlyMemory<byte> buffer)
             }
 
             var recordBatchEnumerator = new RecordBatchEnumerator(in recordBatchMessage);
-
+            var schemaFieldIndex = 0;
             do
             {
-                var field = schema.GetFieldByIndex(recordBatchEnumerator.CurrentNodeIndex);
+                var field = schema.GetFieldByIndex(schemaFieldIndex++);
                 var fieldNode = recordBatchEnumerator.CurrentNode;
 
                 var arrayData = field.DataType.IsFixedPrimitive()

csharp/test/Apache.Arrow.Tests/TestData.cs

@@ -31,6 +31,7 @@ public static RecordBatch CreateSampleRecordBatch(int length, int columnSetCount
             Schema.Builder builder = new Schema.Builder();
             for (int i = 0; i < columnSetCount; i++)
             {
+                builder.Field(CreateField(new ListType(Int64Type.Default), i));
                 builder.Field(CreateField(BooleanType.Default, i));
                 builder.Field(CreateField(UInt8Type.Default, i));
                 builder.Field(CreateField(Int8Type.Default, i));
@@ -52,8 +53,6 @@ public static RecordBatch CreateSampleRecordBatch(int length, int columnSetCount
                 //builder.Field(CreateField(StringType.Default));
                 //builder.Field(CreateField(Time32Type.Default));
                 //builder.Field(CreateField(Time64Type.Default));
-
-                builder.Field(CreateField(new ListType(Int64Type.Default), i));
             }
 
             Schema schema = builder.Build();